US4486092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanism for preventing collision of half-speed mirror from occurring in variable scale factor copying apparatus
Assignee: Pentax Corp
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Filing: 1983-05-20
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Granted: 1984-12-04
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Expires: 2003-05-20
Abstract
Abstract A collision preventing mechanism for preventing a collision between a zoom lens system and a half-speed mirror in a variable scale factor copying apparatus for forming an electrostatic, latent image through the lens system onto a photo-sensitive drum by scanning an original document by a full-speed mirror and the half-speed mirror includes a device for moving the zoom lens system away from the half-speed mirror when an abnormal approach of the half-speed mirror causes the half-speed mirror to be moved into the vicinity of a zone which is occupied by the zoom lens system. This mechanism also includes a detector for detecting the abnormal approach of the half-speed mirror.
Inventors
- 👤 Kazuhiro Ichinokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:35
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526; G03G; G03G15/00; G03G15/04; G03G15/041
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
140 words
A collision preventing mechanism for preventing a collision between a lens system and a half-speed mirror in a variable scale factor copying apparatus for forming an electrostatic latent image through said lens system onto a photo-sensitive drum by scanning an original document by a full speed mirror and said half-speed mirror, comprising: a half-speed mirror and a lens system; means for moving said half-speed mirror; means for moving said lens system to achieve a designated copying scale factor and for further moving said lens system away from said half-speed mirror when an abnormal approach of said half-speed mirror causes said half-speed mirror to be moved into a vicinity of a zone occupied by said lens system to prevent a collision between said half-speed mirror and said lens system; and detecting means for detecting said abnormal approach of said half-speed mirror.
Claim 2
Dependent Claim
140 words
A collision preventing mechanism for preventing a collision between a lens system and a half-speed mirror in a variable scale factor copying apparatus for forming an electrostatic latent image through said lens system onto a photo-sensitive drum by scanning an original document by a full speed mirror and said half-speed mirror, comprising: a half-speed mirror and a lens system; means for moving said half-speed mirror; means for moving said lens system to achieve a designated copying scale factor and for further moving said lens system away from said half-speed mirror when an abnormal approach of said half-speed mirror causes said half-speed mirror to be moved into a vicinity of a zone occupied by said lens system to prevent a collision between said half-speed mirror and said lens system; and detecting means for detecting said abnormal approach of said half-speed mirror.
Claim 3
Dependent Claim
57 words
The mechanism as claimed in claim 1, wherein said means for moving said lens system includes a guide rod bridged on a copying apparatus body and a frame slidably mounted on said guide rod and movable along a direction substantially parallel to an optical axis of said lens system, said lens system being fixed on said frame.
Claim 4
Dependent Claim
109 words
The mechanism as claimed in claim 2, wherein said means for moving said lens system further includes: a shaft; a swing member rotatably supported on said shaft; a rod-like feed screw; a motor; transmission means for engaging said motor with said feed screw to turn said feed screw a predetermined amount determined by said designated copying scale factor; a semiring-like nut attached to a front end of said swing member and being selectively engageable with said rod-like feed screw; and means for moving said semiring-like nut out of engagement with said feed screw when said half-speed mirror moves into said vicinity of said zone occupied by said lens system.
Claim 5
Dependent Claim
61 words
The mechanism as claimed in claim 3, wherein said semiring-like nut moving means comprises an L-shaped release lever having a forward end portion located in a position confronting said half-speed mirror so as to extend forward from a front surface of said zoom lens system and having a rear end portion in contact with said front end of said swing member.
Claim 6
Dependent Claim
82 words
The mechanism as claimed in claim 4, wherein said release lever is pivotally supported at a bent portion thereof on a forward end of an L-shaped arm portion of said supporting frame, said release lever having a swing hole formed therein in a vicinity of said bent portion, and further comprising a pin extending from said arm portion of said supporting frame into said hole of said release member, said pin-hole arrangement restricting an amount of pivotable movement of said release lever.
Claim 7
Dependent Claim
37 words
The mechanism as claimed in claim 5, further comprising a rod-like member fixed at a forward end of said swing member, said detecting means including a detector having a push-button portion selectively engageable with said rod-like member.
References Cited (Backward Citations)
US4373803A
Cited
US4436416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |