Claims
- 1. A variable magnification optical system for projecting an image onto a projection surface, comprising:
- a lens for forming an image of an original document on the projection surface, said lens having an optical axis;
- a lens moving member supporting said lens;
- a mirror group arranged between said lens and the projection surface, for directing light from said lens to the projection surface;
- a lens driving mechanism that drives the lens moving member in a direction of the optical axis of said lens to vary the magnification of the projected image;
- a housing having a bottom base plate, a front side at one end in the direction of said optical axis, and a rear side in the direction of said optical axis, said housing being open at a top side, and said housing accommodating said lens, said lens moving member, said mirror group, and said lens driving mechanism;
- a light shielding cover shielding a top side of said base plate and extending from said rear side of said housing toward said front side of said housing, a space for allowing image-forming light into said housing being formed between said light shielding cover and said front side of said housing;
- a flexible light shielding member attached to an upper portion of said lens moving member, said flexible light shielding member extending in the direction of said rear side of said housing, and said flexible light shielding member sized to block said space between said light shielding cover and said front side of said housing; and
- a guide member formed at said rear side of said housing for urging said flexible light shielding member in a downward direction when said lens moving member is moved to said rear side of said housing.
- 2. The variable magnification optical system according to claim 1,
- said flexible light shielding member being formed of a resilient material having elasticity.
- 3. The variable magnification optical system according to claim 1,
- wherein said guide member is attached to said light shielding cover.
- 4. The variable magnification optical system according to claim 1, further comprising:
- a mirror driving mechanism that drives said mirror group in a direction of the optical axis of said lens to vary a magnification of the projected image in response to the driving of said lens moving member.
- 5. A variable magnification optical system for projecting an image onto a projection surface, comprising:
- a lens for forming an image of an original document on the projection surface;
- a lens moving member supporting said lens;
- a mirror group arranged between said lens and the projection surface, for directing light from said lens to the projection surface;
- a mirror moving member supporting said mirror group;
- a lens driving mechanism that drives said lens moving member in a direction of an optical axis of said lens to vary a magnification of the projected image;
- a housing accommodating said lens, a lens moving member, said mirror group, said mirror moving member, and said lens driving mechanism;
- a light shielding member, inclinably supported by a portion of said housing in said moving range of said lens moving member, that blocks light from passing beside said lens moving member to said mirror group when said light shielding member is in an upright position; and
- a biasing member that biases said light shielding member to said upright position.
- 6. The variable magnification optical system according to claim 5, further comprising:
- a pivot support provided on a surface of said housing in a moving range of said lens moving member that swingably supports said light shielding member to be inclinable and swingable about an axis.
- 7. The variable magnification optical system according to claim 5, said lens moving member comprising a surface contactable to said light shielding member,
- wherein said lens moving member inclines said light shielding member when said surface contacts and pushes said light shielding member.
- 8. The variable magnification optical system according to claim 7, said surface contactable to said light shielding member being a cutoff portion formed in said lens moving member and facing said portion of said housing supporting said light shielding member.
- 9. The variable magnification optical system according to claim 5, further comprising:
- a flexible light shielding member attached to a side portion of said lens moving member, said flexible light shielding member extending away from said lens moving member and toward said housing, and said flexible light shielding member sized to block a space between said lens moving member and a side of said housing.
- 10. The variable magnification optical system according to claim 5, further comprising a mirror driving mechanism that drives said mirror moving member in the direction of the optical axis of said lens to vary the magnification of the projected image in response to said driving of said lens moving member.
Priority Claims (3)
Number |
Date |
Country |
Kind |
7-119263 |
Apr 1995 |
JPX |
|
7-119264 |
Apr 1995 |
JPX |
|
7-119265 |
Apr 1995 |
JPX |
|
Parent Case Info
This application is a divisional of application No. Ser. 08/633,524, filed Apr. 17, 1996, now abandoned, the contents of which herein incorporated by reference in its entirety.
US Referenced Citations (11)
Divisions (1)
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Number |
Date |
Country |
Parent |
633524 |
Apr 1996 |
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