Patent US3577173A successfully refreshed from Google Patents.
US3577173A
Expired / Lapsed
US
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Lamp failure detection and change device
Assignee: 3M Co
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Filing: 1969-01-10
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Granted: 1971-05-04
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Expires: 1989-01-10
Abstract
Abstract A projector which has a device for automatically replacing an expired main lamp with a spare lamp. The main lamp and the spare lamp are socketed in a lamp-changing mechanism which is operated in response to the operation of a lamp failure detector. The detector radiantly senses the failure of the main lamp and automatically activates the lamp-changing mechanism which will remove the main lamp from the focus position, advance the spare lamp into the focus position, and energize the spare lamp.
Inventors
- 👤 Jack P Blomgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:51
CPC Classifications
H; H05; H05B; H05B39/00; H05B39/10; G; G03; G03B; G03B21/00; G03B21/14; G03B21/20; G03B21/2006; G03B21/2013; G03B21/206
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
264 words
A device having particular utility in a light projecting system for detecting the failure of a main lamp and automatically replacing the expired main lamp in the optical system with a spare lamp, said device comprising in combination: 1. a frame; 2. a lamp-changing mechanism having: a. a lamp support mounted on said frame for movement from a first set position to a second set position; b. a main lamp and a spare lamp mounted on said lamp support, to position said main lamp in a predetermined position when said support is in said first set position and to position said spare lamp in the predetermined position when said support is in said second set position; c. actuation means operably connected to said support for moving said lamp support between said first set position and said second set position; d. first electrical means on said support for electrically connecting the main lamp to a source of electrical energy in said first set position and for connecting said spare lamp to a said source upon movement of said support to said second set position; 3. a lamp failure detector having: a. energy sensing means for detecting and reacting to the interruption of radiant energy from said main lamp; b. release means operatively responsive to the reaction of said energy-sensing means for activating said actuation means; and c. a time delay means operably connected to said energy sensing means for electrically connecTing said energy sensing means to a source of electrical energy after a short period of time has elapsed from initial energization of said device.
Claim 2
Independent Claim
264 words
A device having particular utility in a light projecting system for detecting the failure of a main lamp and automatically replacing the expired main lamp in the optical system with a spare lamp, said device comprising in combination: 1. a frame; 2. a lamp-changing mechanism having: a. a lamp support mounted on said frame for movement from a first set position to a second set position; b. a main lamp and a spare lamp mounted on said lamp support, to position said main lamp in a predetermined position when said support is in said first set position and to position said spare lamp in the predetermined position when said support is in said second set position; c. actuation means operably connected to said support for moving said lamp support between said first set position and said second set position; d. first electrical means on said support for electrically connecting the main lamp to a source of electrical energy in said first set position and for connecting said spare lamp to a said source upon movement of said support to said second set position; 3. a lamp failure detector having: a. energy sensing means for detecting and reacting to the interruption of radiant energy from said main lamp; b. release means operatively responsive to the reaction of said energy-sensing means for activating said actuation means; and c. a time delay means operably connected to said energy sensing means for electrically connecTing said energy sensing means to a source of electrical energy after a short period of time has elapsed from initial energization of said device.
Claim 3
Dependent Claim
26 words
a third bimetal means adjacent said third electrical means for mechanically reacting to the heat energy in said third electrical means to activate said actuation means.
Claim 4
Dependent Claim
26 words
a third bimetal means adjacent said third electrical means for mechanically reacting to the heat energy in said third electrical means to activate said actuation means.
Claim 5
Dependent Claim
47 words
a second bimetal means adjacent said second electrical means for mechanically reacting to the heat energy in said second electrical means to electrically connect said energy-sensing means to a source of electrical energy after a short period of time has elapsed from initial energization of said device.
Claim 6
Dependent Claim
47 words
a second bimetal means adjacent said second electrical means for mechanically reacting to the heat energy in said second electrical means to electrically connect said energy-sensing means to a source of electrical energy after a short period of time has elapsed from initial energization of said device.
Claim 7
Dependent Claim
43 words
The device according to claim 1 wherein said energy-sensing means includes a first bimetal means adjacent the main lamp for mechanically reacting to the interruption of energy through said main lamp to electrically connect said release means to the source of electrical energy.
Claim 8
Dependent Claim
141 words
a lamp-changing mechanism having: a. a lamp support mounted on said frame for movement from a first set position to a second set position; b. a main lamp and a spare lamp mounted on said lamp support, to position said main lamp in a predetermined position when said support is in said first set position and to position said spare lamp in the predetermined position when said support is in said second set position; c. actuation means operably connected to said support for moving said lamp support between said first set position and said second set position; d. first electrical means on said support for electrically connecting the main lamp to a source of electrical energy in said first set position and for connecting said spare lamp to a said source upon movement of said support to said second set position;
Claim 9
Dependent Claim
141 words
a lamp-changing mechanism having: a. a lamp support mounted on said frame for movement from a first set position to a second set position; b. a main lamp and a spare lamp mounted on said lamp support, to position said main lamp in a predetermined position when said support is in said first set position and to position said spare lamp in the predetermined position when said support is in said second set position; c. actuation means operably connected to said support for moving said lamp support between said first set position and said second set position; d. first electrical means on said support for electrically connecting the main lamp to a source of electrical energy in said first set position and for connecting said spare lamp to a said source upon movement of said support to said second set position;
Claim 10
Dependent Claim
80 words
a lamp failure detector having: a. energy sensing means for detecting and reacting to the interruption of radiant energy from said main lamp; b. release means operatively responsive to the reaction of said energy-sensing means for activating said actuation means; and c. a time delay means operably connected to said energy sensing means for electrically connecTing said energy sensing means to a source of electrical energy after a short period of time has elapsed from initial energization of said device.
Claim 11
Dependent Claim
80 words
a lamp failure detector having: a. energy sensing means for detecting and reacting to the interruption of radiant energy from said main lamp; b. release means operatively responsive to the reaction of said energy-sensing means for activating said actuation means; and c. a time delay means operably connected to said energy sensing means for electrically connecTing said energy sensing means to a source of electrical energy after a short period of time has elapsed from initial energization of said device.
Claim 12
Dependent Claim
12 words
The device according to claim 2 wherein said time delay means includes:
Claim 13
Dependent Claim
11 words
The device according to claim 3 wherein said release means includes:
Claim 14
Dependent Claim
30 words
The device according to claim 4 further including means responsive to the movement of said support for providing an indication to the operator that the spare lamp is in operation.
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |