US3742830A
Expired / Lapsed
US
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Information holding apparatus
Assignee: Olympus Corp
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Filing: 1972-06-30
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Granted: 1973-07-03
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Expires: 1992-06-30
Abstract
Abstract An information holding apparatus comprising an information input element so disposed as to allow the passage therethrough of certain current corresponding to input light being stored; a field effect transistor connected in series to said information input element; a constant voltage bias source for supplying ias voltage to the information input element and field effect transistor; a capacitor connected between the source and gate of the field effect transistor; and a switch for connecting the transistor to the input element at the time of storing information and selectively connecting the transistor to the load at the time of reading out the information.
Inventors
- 👤 S Matsuzaki
- 👤 I Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:23
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/44; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/089; G11; G11C; G11C27/00; G11C27/02; G11C27/024; H; H03; H03K; H03K17/00; H03K17/28; H03K17/284
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
119 words
An information holding apparatus comprising means for receiving information being stored, a field effect transistor connected in series to said means; a capacitor connected between the gate and source of the field effect transistor; a switch for holding bias voltage across the gate and source of the field effect transistor at the time of storing information; and a power supply source for the aforementioned circuitry with operating voltage, whereby the drain current of the field effect transistor is fed back so as to have the same amount as the current of the information receiving means; and the bias voltage across the gate and source of the field effect transistor is maintained so as to generate the required drain current.
Claim 2
Dependent Claim
119 words
An information holding apparatus comprising means for receiving information being stored, a field effect transistor connected in series to said means; a capacitor connected between the gate and source of the field effect transistor; a switch for holding bias voltage across the gate and source of the field effect transistor at the time of storing information; and a power supply source for the aforementioned circuitry with operating voltage, whereby the drain current of the field effect transistor is fed back so as to have the same amount as the current of the information receiving means; and the bias voltage across the gate and source of the field effect transistor is maintained so as to generate the required drain current.
Claim 3
Dependent Claim
37 words
An information holding apparatus according to claim 1 which further includes a first switch means for selectively connecting the gate of the field effect transistor to the bias voltage source only at the time of storing information.
Claim 4
Dependent Claim
28 words
An information holding apparatus according to claim 2 wherein the information input means consists of a solar cell connected with reverse polarity to a first power supply source.
Claim 5
Dependent Claim
59 words
An information holding apparatus according to claim 3 wherein the field effect transistor is connected in series to the solar cell and load, and there is connected in parallel to the solar cell and a second switch means which is turned off at the time of storing information and is turned on at the time of reproducing said information.
Claim 6
Dependent Claim
58 words
An information holding apparatus according to claim 4 wherein there is connected a third transistor in series to the first switch means and the second transistor is connected in parallel to the load and which comprises a control circuit including an astable multivibrator for cutting off the second and third transistors only at the time of storing information.
Claim 7
Dependent Claim
85 words
An information holding apparatus according to claim 3 wherein the field effect transistor, solar cell and load are connected in series to the first bias voltage source, and which includes a diode connected in series to the solar cell with reverse voltage thereto, a second switch for selectively connecting the anode of the solar cell to either of the gate and source of the field effect transistor and a third switch for bypassing the current running through the load at the time of storing information.
Claim 8
Dependent Claim
85 words
An information holding apparatus according to claim 3 wherein the field effect transistor, solar cell and load are connected in series to the first power supply source and which comprises a control circuit formed of a second switch for selectively connecting the anode of the solar cell to either of the gate and source of the field effect transistor, a second transistor connected in parallel to the load and an astable multivibrator for cutting off the second transistor only at the time of storing information.
Claim 9
Dependent Claim
34 words
An information holding apparatus according to claim 2 wherein the information input means is a transistor so connected as to have its base supplied with an amount of current corresponding to the input information.
Claim 10
Dependent Claim
17 words
An information holding apparatus according to claim 2 wherein the field effect transistor is of junction type.
Claim 11
Dependent Claim
17 words
An information holding apparatus according to claim 2 wherein the field effect transistor is of MOS type.
Claim 12
Dependent Claim
25 words
An information holding apparatus according to claim 7 wherein the first switch means is connected between the drain and source of the field effect transistor.
Claim 13
Dependent Claim
36 words
An information holding apparatus according to claim 11 wherein there is connected a second bias voltage source in series to the first switch means with the same polarity as that of the first power supply source.
Claim 14
Dependent Claim
70 words
An information holding apparatus according to claim 1 wherein the load has an electric shutter circuit which controls the shutter of a photographic camera; said circuit including a capacitor for being charged with the drain current of the field effect transistor at the time of reading out information, thereby determining the shutter speed of said camera according to the length of time required for the capacitor to be thus charged.
Claim 15
Dependent Claim
117 words
An information holding apparatus according to claim 13 wherein the load further comprises an exposure alarm device consisting of an astable circuit for generating pulses of a prescribed width corresponding to the largest number of seconds required to eliminate the effect of the shaking of the hand depressing the shutter button of said camera; a circuit for producing pulses of a prescribed width corresponding to the standard smallest number of seconds required to prevent overexposure; a circuit for comparing outputs from the astable circuit and pulse generating circuit with the shutter driving pulses obtained from the electric shutter circuit; and a device for detecting a proper length of time required for exposure by outputs from said comparator.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |