Camera

Abstract

There is disclosed a camera having a first imaging medium which acquires subject image data from a subject light flux transmitted through a photographing lens; an optical path branching member which is disposed in an image pickup optical path of the first imaging medium to branch an optical path of the subject light flux; a primary image forming surface on which the subject light flux branched by the optical path branching member forms an image; and a second imaging medium which picks up the subject image formed on the primary image forming surface. When the present camera satisfies at least one of a plurality of optical conditions, the amount of shading of the light flux guided to the second imaging medium is reduced.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

These and other features, aspects, and advantages of the apparatus and methods of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings where:

FIG. 1 is a schematic constitution diagram showing an arrangement relation between optical members during subject observation before photographing in a camera according to a first embodiment of the present invention;

FIG. 2 is a schematic constitution diagram showing an arrangement relation between the optical members during subject photographing in the camera of FIG. 1;

FIG. 3 is a schematic constitution diagram showing an arrangement relation between optical members in a camera according to a second embodiment of the present invention;

FIG. 4 is a schematic constitution diagram showing an arrangement relation between optical members at a time when a subject is observed with an optical finder in a camera according to a third embodiment of the present invention;

FIG. 5 is a schematic constitution diagram showing an arrangement relation between the optical members at a time when a subject image picked up by a second image sensor is observed with a monitor in the camera of FIG. 4;

FIG. 6 is a sectional view along an optical axis, showing an optical constitution of a secondary image forming optical system 30 in a camera according to Example 1 of the present invention;

FIG. 7 is a diagram of various aberrations of the secondary image forming optical system 30 shown in FIG. 6;

FIG. 8 is a sectional view along an optical axis, showing an optical constitution of a secondary image forming optical system 30 in a camera according to Example 2 of the present invention;

FIG. 9 is a diagram of various aberrations of the secondary image forming optical system 30 shown in FIG. 8;

FIG. 10 is a sectional view along an optical axis, showing an optical constitution of a secondary image forming optical system 30 in a camera according to Example 3 of the present invention;

FIG. 11 is a diagram of various aberrations of the secondary image forming optical system 30 shown in FIG. 10;

FIG. 12 is a sectional view along an optical axis, showing an optical constitution of a finder optical system 20 in a camera according to Example 4 of the present invention in a state in which a diopter scale is −1 diopter;

FIG. 13 is a schematic constitution diagram showing an arrangement constitution of optical members of an electronic camera according to a fourth embodiment of the present invention;

FIG. 14 is a sectional view along an optical axis, showing a constitution of an eyepiece lens system of the electronic camera according to the fourth embodiment of the present invention;

FIG. 15 is a sectional view along the optical axis, showing a constitution of a secondary image forming optical system of the electronic camera according to the fourth embodiment of the present invention;

FIG. 16 is a sectional view along the optical axis, showing a constitution of a photometry optical system of the electronic camera according to the fourth embodiment of the present invention;

FIG. 17 is a sectional view along an optical axis, showing a constitution of a secondary image forming optical system of an electronic camera according to a fifth embodiment of the present invention;

FIG. 18 is a sectional view along an optical axis, showing a constitution of a secondary image forming optical system of an electronic camera according to a sixth embodiment of the present invention;

FIG. 19 is a schematic constitution diagram showing an arrangement constitution of optical members during subject observation of an electronic camera according to a seventh embodiment of the present invention;

FIG. 20 is a schematic constitution diagram showing an arrangement constitution of the optical members during subject photographing of the electronic camera according to the seventh embodiment of the present invention;

FIG. 21 is a schematic constitution diagram showing an arrangement constitution of optical members during subject observation of an electronic camera according to an eighth embodiment of the present invention; and

FIG. 22 is a schematic constitution diagram showing an arrangement constitution of the optical members during subject photographing of the electronic camera according to the eighth embodiment of the present invention.

Claims

1. A camera comprising: a first imaging medium which acquires subject image data from a subject light flux transmitted through a photographing lens;an optical path branching member which is disposed in an image pickup optical path of the first imaging medium to branch an optical path of the subject light flux;a primary image forming surface on which the subject light flux branched by the optical path branching member forms an image;a second imaging medium which picks up the subject image formed on the primary image forming surface; anda secondary image forming optical system which projects the subject image formed on the primary image forming surface onto the second imaging medium,wherein at least one of the following conditions 1 to 5 are satisfied:Condition 1: the camera has a finder optical system which is disposed in an optical path in a direction different from that of the first imaging medium and through which the subject image formed on the primary image forming surface is observed, and the camera satisfies the following equation (1): |TAN−1(OBJH/ENP1)−TAN−1(OBJH/ENP2)|≦20°  (1),

2. The camera according to claim 1, wherein the secondary image forming optical system includes at least one or more plastic lenses.

3. The camera according to claim 1, wherein the secondary image forming optical system includes at least one or more aspherical lenses.

4. The camera according to claim 1, wherein an image sensor for use in the second imaging medium is smaller in size than an image sensor for use in the first imaging medium.

5. The camera according to claim 1, further comprising: a photographing information display member and a focused portion display member as a part of common optical members constituting the finder optical system and the secondary image forming optical system.

6. The camera according to claim 1, wherein at least one of a surface having a condensing function and a mat surface is disposed in parallel with the primary image forming surface in the vicinity of the primary image forming surface.

7. The camera according to claim 6, further comprising: the finder optical system,wherein the following condition equation is satisfied: |TAN−1(OBJH/ENP1)−TAN−1(OBJH/ENP2)|≦15°,

8. The camera according to claim 1, wherein the secondary image forming optical system includes a plurality of optical reflective surfaces.

9. The camera according to claim 8, wherein some of the plurality of optical reflective surfaces have a light transmitting property.