Portable projection device

• US 5,143,442 A
• Filed: 05/07/1991
• Issued: 09/01/1992
• Est. Priority Date: 05/07/1991
• Status: Expired due to Fees

• Current Assignee: Tamapack Co., Ltd.
• Original Assignee: Tamapack Co., Ltd.
• Inventors: Yamada, Masao, Ishikawa, Masaaki
• Primary Examiner(s): Lazarus, Ira S.
• Assistant Examiner(s): Hagarman, Sue
• Application Number:
  US07/696,643
• Time in Patent Office: 483 Days
• Field of Search: 362/800, 362/184, 362/196, 362/231, 362/208, 362/205, 362/253, 350/345
• US Class Current: 362/253
• CPC Class Codes: G03B 21/00 Projectors or projection-type viewers; Accessories therefor devices for changing pictures G03B23/00
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A portable projection device has a case-like body made of synthetic resin and formed hollow in which a lens, a circuit connected to a light emitting means, a power source and resistances, a display film and a film setting section are arranged and housed. The circuit is opened and closed by a switch arranged on the case-like body to thereby render the portable projection device operative and inoperative. The portable projection device can be used as a time-displaying timepiece, a flashlight, an alarm lamp, a guide lamp or the like.

Claims

1. A portable projection device comprising

a case-like body,

a light-passing hold formed in a wall of said body,

a light-emitting means located within said body, opposite to said light-passing hole,

a power source located within said body for providing power to operate said light-emitting means,

a removable lens system covering said light-passing hole,

a display means within said body, interposed said light-emitting means and said light-passing hole, an image on said display means being projected from said portable projection device through said light-passing hole and said removable lens system when light is emitting from said light-emitting means,

a slidable switch having a plurality of operational positions, and

an electronic circuit means for controlling operation of said light-emitting means in response to said slidable switch being positioned to an operational position, said electronic circuit means including first and second interconnected NOR gates and a switching transistor.

2. The portable projection device according to claim 1, wherein said light emitting means comprises a high-brightness light-emitting diode.

3. The portable projection device according to claim 1, wherein said display means comprises a display film.

4. The portable projection device according to claim 1, wherein said display means comprises a liquid-crystal display element.

5. The portable projection device according to claim 1, wherein said electronic circuit means controls said light-emitting means to flicker.

6. The portable projection device according to claim 1, wherein said removable lens system comprises a composite lens system.

7. The portable projection device according to claim 1, wherein,

a first contact position is connected to a collector of said switching transistor and to said light-emitting means, a second contact position is connected to a first input of said first NOR gate, and said first input of said NOR gate is also connected to ground, a third contact position is connected to an emitter of said switching transistor and to a negative electrode of said power source through a fourth and fifth contact position, an output of said first NOR gate is connected to first and second inputs of said second NOR gate and to a base of said switching transistor, and an output of said second transistor is connected to a second input of said first NOR gate through an RC circuit.

8. The portable projection device according to claim 7, further comprising a clock means connected to said power source for generating a time function, and said display means includes a liquid-crystal display element connected to said clock means for displaying said time function, wherein

said time function is projected from said portable projection device.

9. The portable projection device according to claim 1, wherein said light-emitting means is a plurality of light emitting diodes of different brightness levels and said electronic circuit means controls said light emitting diodes to emit light simultaneously or selectively.

10. The portable projection device according to claim 9, wherein said plurality of light emitting diodes are of different colors.