US4286147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In-focus detecting device
Assignee: Universal Pioneer Corp
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Filing: 1979-07-19
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Granted: 1981-08-25
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Expires: 1999-07-19
Abstract
Abstract A focus lens protecting and in-focus detecting device has light receiving circuit and a comparator for comparing the output of said light receiving elements with a reference potential. A switch network is controlled by the output of the comparator to supply signals to a focus control amplifier from the light receiving circuit.
Inventors
- 👤 Hiroaki Tsuboi
- 👤 Toshihiko Hosaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:31
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0945; G02; G02B; G02B7/00; G02B7/28; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/16; G11B7/085; G11B7/08505; G11B7/08511; G11B7/0908
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
61 words
An in-foucs detecting device for a lens of an optical video disk player comprising; light quantity detecting means, comparator means for comparing the output of said light quantity detecting means with a reference voltage; switch means controlled by the output of said comparator means, and means for preventing said lens from contacting a disk being played on said video disk player.
Claim 2
Dependent Claim
61 words
An in-foucs detecting device for a lens of an optical video disk player comprising; light quantity detecting means, comparator means for comparing the output of said light quantity detecting means with a reference voltage; switch means controlled by the output of said comparator means, and means for preventing said lens from contacting a disk being played on said video disk player.
Claim 3
Dependent Claim
93 words
A focus lens protecting device for use in an optical video disk player comprising: light quantity detecting means; comparator means for comparing the output of said light quantity detecting means with a reference potential; switch means controlled by the output of said comparator means; a focus control amplifier operable to drive said lens toward or away from a disk being played on said video disk player; and means receiving the output of said switch means for applying the output of said light quantity detecting means to the input of said focus control amplifier.
Claim 4
Dependent Claim
93 words
A focus lens protecting device for use in an optical video disk player comprising: light quantity detecting means; comparator means for comparing the output of said light quantity detecting means with a reference potential; switch means controlled by the output of said comparator means; a focus control amplifier operable to drive said lens toward or away from a disk being played on said video disk player; and means receiving the output of said switch means for applying the output of said light quantity detecting means to the input of said focus control amplifier.
Claim 5
Independent Claim
36 words
The device of claims 1 or 2 wherein said light receiving means comprises a first amplifier quantity detecting first and second sum signals indicative of lens position and a second amplifier receiving said second sum signal.
Claim 6
Dependent Claim
28 words
The device of claim 3 wherein said second sum signal is applied to the inversion terminal of said first amplifier and the non-inversion terminal of said second amplifier.
Claim 7
Dependent Claim
31 words
The device of claim 3 wherein said comparator means comprises a first comparator receiving the output of said first amplifier and a second comparator receiving the output of said second amplifier.
Claim 8
Dependent Claim
38 words
The device of claim 5 further comprises a pair of transistors coupled to said second comparator and a first output terminal from one transistor providing a signal indicative of the distance between said lens and a focusing surface.
Claim 9
Dependent Claim
22 words
The device of claim 3 further comprising a third amplifier receiving the output of said first amplifier at an inversion terminal thereof.
Claim 10
Dependent Claim
18 words
The device of claim 7 further comprising differentiation means coupled between said third amplifier and said switch means.
Claim 11
Independent Claim
20 words
The device of claims 1 or 2 further comprising differentiation means coupled between said comparator means and said switch means.
Claim 12
Dependent Claim
27 words
The device of claim 1 or 2 wherein said switch means comprises a NAND circuit flip-flop switch and amplifier means receiving the output of said flip-flop switch.
Claim 13
Dependent Claim
29 words
The device of claim 10 wherein said NAND circuit flip-flop switch receives a first logic signal from said comparator means and a second logic signal from an input terminal.
Claim 14
Dependent Claim
29 words
The device of claim 11 further comprising a differentiation circuit and an inverter coupling said comparator means to said NAND circuit flip-flop switch for supplying said first logic signal.
Claim 15
Dependent Claim
46 words
The device of claim 2 wherein said means for applying the output of said light quantity detecting means comprises an array of switch elements having gates controlled by said switch means, said switch elements interposed between said light quantity detecting means and said focus control amplifier.
Claim 16
Dependent Claim
31 words
The device of claim 13 further comprising amplifier means receiving the output of said light receiving means, and a differentiation circuit coupling said amplifier means to said array of switching elements.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |