Automatic focusing camera base

Abstract

An automatic focusing camera base has a seat, a motor, a focusing device, a contact set, and a transmission device. The motor is mounted on the seat and has a shaft. The focusing device is mounted on the seat, which can move relative to the seat. The contact set is mounted on the seat, connected to the motor and a detecting circuit for the zero adjustment of the focusing device and has a first conductive member connected to the shaft and a second conductive member. The transmission device is mounted between the motor and the focusing device and has an active member selectively contacts the second conductive member. The active member and the motor are responsible for driving the focusing device and activating the detecting circuit without a ray-emitter and a ray-interceptor. The structure of the automatic focusing camera base is simple and compact.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a camera base, and particularly to an automatic focusing camera base that has a motor, a focusing device and a transmission device with an active member cooperating with the motor to proceed with zero adjustment and movement of the focusing device.

2. Description of the Related Art

With the development of the communication industry, the cell phone including a camera is widely used.

The conventional camera mounted in the cell phone has an automatic focusing function. The camera has a motor, a camera lens, a focusing device, a transmission device and a positioning device. The lens is connected to the focusing device, and the transmission device is mounted between the motor and the focusing device, so that the motor is responsible for the focusing device adjustment through the transmission device. The positioning device has a ray-emitter, a ray-receiver end and a ray-interceptor, wherein the ray-cutter is driven by the motor. When the ray-cutter moves to intercept the ray from the ray-emitter, the ray-receiver gives a signal to a micro-controller, and the focusing device is adjusted to zero.

However, the positioning device is square, and takes up a lot of space, so the size of the cell phone is limited by the camera and is incompact.

Therefore, the invention provides an automatic focusing camera base to mitigate or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide an automatic focusing camera base an automatic focusing camera base that has a motor, a focusing device and a transmission device with an active member cooperating with the motor to proceed with zero adjustment and movement of the focusing device.

An automatic focusing camera base in accordance with the present invention has a seat, a motor, a focusing device, a contact set, and a transmission device. The motor is mounted on the seat and has a shaft. The focusing device is mounted on the seat, which can move relative to the seat. The contact set is mounted on the seat, connected to the motor and a detecting circuit for the zero adjustment of the focusing device and has a first conductive member connected to the shaft and a second conductive member. The transmission device is mounted between the motor and the focusing device and has an active member selectively contacts the second conductive member. The active member and the motor are responsible for driving the focusing device and activating the detecting circuit without a ray-emitter and a ray-interceptor.

Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partially exploded perspective view of the automatic focusing camera base in accordance with this invention;

FIG. 2 is an exploded perspective view of the automatic focusing camera base in FIG. 1;

FIG. 3 is another exploded perspective view of the automatic focusing camera base in FIG. 1;

FIG. 4 is a partially exploded perspective view of the motor, the first and second conductive members and the active member of the camera base in FIG. 1;

FIG. 5 is a side view of the automatic focusing camera base in FIG. 1;

FIG. 6 is a cross sectional side view of the automatic focusing camera base in FIG. 4; and

FIG. 7 is an operational cross sectional side view of the automatic focusing camera base in FIG. 5.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

With reference to FIGS. 1-2, an automatic focusing camera base is adapted to be mounted with a lens, and is mounted in portable electric appliance such as a cell phone. The automatic focusing camera base has a seat (10), a motor (30), a focusing device (20), a contact set (40), a transmission device (50), and a cover (60).

The seat (10) has a first lens hole (11) defined in the seat (10), a pivot seat (13) formed on the seat (10), two mounting holes (15, 17) defined respectively through two sides of the seat (10) and at least one rail rod protrudes from the seat (10). The pivot seat (13) has a pivot slot (131) defined the pivot seat (13).

With reference to FIGS. 2, 4 and 5, the motor (30) is mounted and horizontally lies on the seat (10), and the motor (30) has an axis, a housing, a threaded shaft (31) and a conductive element. The axis is perpendicular to the at least one rail rod on the seat (10). The threaded shaft (31) is conductive, is perpendicular to the at least one rail rod on the seat (10), extends through and contacts the housing of the motor (30) and has two ends and may have an electric contact (33) formed on one end. The conductive element is attached to the motor (30), may be the housing and may be the electric contact (33) on the threaded shaft (31). The motor (30) is connected to a driving circuit (32), which is mounted on a thin film circuit board. The driving circuit (32) is further connected to a main control circuit, which controls the operation of the motor (30).

The focusing device (20) is mounted slidably on the at least one rail rod on the seat (10) and is movable along a linear line perpendicular to the axis of the motor (30). In addition, the focusing device (20) has a second lens hole (21) defined in the focusing device (20) and corresponding to the first lens hole (11), a protruding block (24) formed on an outer edge of the focusing device (20), and a post (22) formed on an outside surface of the focusing device (20) opposite to the seat (10). A spring (23) is mounted around the post (22).

The contact set (40) is mounted on the seat and connected to the motor (30) and is connected to a detecting circuit with a micro-controller and a signal source. The contact set (40) has a first conductive member (41) and a second conductive member (43), which are mounted on the seat (10) respectively through the mounting holes (15, 17). The first conductive member (41) is L-shaped, has a first end, a second end, a first contact (411). The first contact (411) is spring-shaped, is formed on the first end, is connected to the conductive element of the motor (30) and may be connected to the housing or the electric contact (33) on the threaded shaft (31). The second end of the first conductive member (41) is connected to the signal source being a 3 voltages (V) signal source mounted in the portable electric appliance. The second conductive member (43) is L-shaped, has a first end, a second end, a second contact (431) being a knob formed on the first end and aligned with the threaded shaft (31). The second end of the second conductive member (43) is connected to the micro-controller of the detecting circuit. When the threaded shaft (31) is connected electrically with the second contact (431) through the conductive element, the detective circuit is activated and the micro-controller receives the signal from the 3V signal source to make a zero adjustment to the focusing device (20). The position of the focusing device (20) is zeroed and is defined as an original point.

With reference to FIGS. 2 and 4, the transmission device (50) is mounted between the motor (30) and the focusing device (20) and is in response to the motor (30) to move the focusing device (20). The transmission device (50) has an active member (51) and a passive member (52).

The active member (51) is conductive, is a nut mounted around the threaded shaft (31), is movable along the threaded shaft (31) and selectively contacts the second contact (431) of the second conductive member (431). The nut has a threaded hole (511) defined through the nut and through which the threaded shaft (31) is mounted. In addition, a protrusion (512) protrudes from the active member (51). The passive member (52) is mounted pivotally on the seat (10), abuts the active member (51) and is driven by the active member (51) to pivot and move the focusing device (20). The passive member (52) is L-shaped and has a pivot member (521), a first arm, a second arm, a driven member (523) and a driving member (525). The first and second arms protrude from the pivot member (521) with a space between the first and second arms and through which the protrusion (512) of the active member (51) extends. Therefore, the passive member (52) is limited between the pivot seat (13) and the protrusion (512), so the passive member (52) can safely pivot on the seat (10) without a fastener such as a bolt or pin and never falls out of the seat (10). The pivot member (521) is formed on the passive member (52), may be formed between the two arms and is mounted rotatably in the pivot slot (131) in the pivot seat (13). The driven member (523) is formed in a distal end of the first arm and presses against the protrusion (512) of the active member (51). The driving member (525) is formed on the passive member (52), may be formed in a distal end of the second arm and presses against the protruding block (24) of the focusing device (20).

The cover (60) is mounted on the seat (10), covers the motor (30), the focusing device (20), the contact set (40) and the transmission device (50) and the cover (60) presses against the spring (23) around the post (22). The cover (60) has a third lens hole (61) defined through the cover (60) and an opening (611) defined through the cover (60) and through which the post (22) extends.

With reference to FIG. 5 and 6, when the position of the focusing device (20) is about to be zeroed, the active member (51) contacts the second contact (431) of the second conductive member (43). The detecting circuit is activated and then the micro-controller receives signals from the 3V signal source and zeros the position of the focusing device (20).

With reference to FIG. 7, the motor (30) is driven by the main control circuit to rotate. The active member (51) is brought to be away from the second conductive member (43) and then the detecting circuit is cut off. The passive member (52) is pushed by the active member (51), so the focusing device (20) moves away from the seat (10). Meanwhile, the main control circuit calculates a displacement of the focusing device (20) according to the original position of the focusing device (20).

Besides driving the focusing device (20), the motor (30) and the active member (51) also cooperate to activate the detecting circuit for the zero adjustment of the focusing device (20) without a ray-emitter and a ray-interceptor. Therefore, the structure of the automatic focusing camera base is simple and compact as compared with a conventional camera base.

Furthermore, the transmission device (50) are designed especially to cooperate with and allow the motor (30) to horizontally lie on the seat (10) instead of upright standing. The lying motor (30) reduces a thickness of the automatic focusing camera base along the linear line perpendicular to the axis of the motor (30). Therefore, the automatic focusing camera base is thin and compact and a mobile apparatus such cellular phone equipped with the automatic focusing camera base becomes marketable.

Claims

1. An automatic focusing camera base comprising: a seat having at least one rail rod protruding from the seat; a motor mounted on the seat, connected to a driving circuit and having a conductive element attached to the motor and a shaft being conductive and connected to the conductive element; a focusing device slidably mounted on the at least one rail rod on the seat; a contact set mounted on the seat and adapted to be connected to a detecting circuit with a micro-controller and a signal source, and having a first conductive member mounted on the seat and having a first end, a second end adapted to be connected to the signal source of the detecting circuit, a first contact formed on the first end and connected to the conductive element of the motor and a second conductive member mounted on the seat and having a first end, a second end adapted to be connected to the micro-controller of the detecting circuit, a second contact formed on the first end of the second conductive member; and a transmission device mounted between the motor and the focusing device, being in responsive to the motor to move the focusing device and having an active member being conductive, mounted around the shaft, being movable along the shaft and selectively contacting the second contact of the second conductive member to activating the detecting circuit; whereby the micro-controller receives signals from the signal source and zeros a position of the focusing device when the detecting circuit is activated by the active member contacting the second contact of the second conductive member.

2. The automatic focusing camera base as claimed in claim 1, wherein the shaft is a threaded shaft, and the active member is a nut, which has a threaded hole defined through the nut and through which the threaded shaft is mounted.

3. The automatic focusing camera base as claimed in claim 2, wherein the seat further has two mounting holes defined through the seat, and the first and second conductive members are mounted on the seat respectively through the mounting holes.

4. The automatic focusing camera base as claimed in claim 3, wherein the first conductive member is L-shaped, the first contact of the first conductive member is spring-shaped.

5. The automatic focusing camera base as claimed in claim 4, wherein the second conductive member is L-shaped, and the second contact of the second conductive member is a knob.

6. The automatic focusing camera base as claimed in claim 1, wherein the conductive element is an electric contact formed on one end of the shaft and contacting the first contact of the first conductive member.