Safety shutter

• US 6,407,873 B1
• Filed: 06/26/1999
• Issued: 06/18/2002
• Est. Priority Date: 06/26/1999
• Status: Expired due to Term

• Current Assignee: Electro-Optical Products Corporation
• Original Assignee: Electro-Optical Products Corporation
• Inventors: Tuchman, Israel
• Primary Examiner(s): CHANG, AUDREY Y
• Application Number:
  US09/344,412
• Time in Patent Office: 1,088 Days
• Field of Search: 396/132, 396/133, 396/488, 396/183, 396/490, 396/484, 359/466, 359/894, 251/215, 251/187, 250/105, 250/496.1, 250/106, 250/506.1
• US Class Current: 359/894
• CPC Class Codes: G02B 5/005 Diaphragms for cameras G03B9/02

Abstract

A safety shutter suitable for intercepting an energy beam. The safety shutter includes at least one shutter blade having a top end and a bottom end. At least one motor is coupled to the bottom end of the shutter blade such that the motor rotates the shutter blade from a closed position to an open position when energized. The shutter blade is coupled to at least one spring, wherein the spring rotates the shutter blade from the open position to the closed position when the motor is de-energized.

Claims

1. A safety shutter suitable for intercepting an energy beam, the safety shutter comprising:

a first shutter blade having a top end and a bottom end;

a second shutter blade having a top end and a bottom end;

a first motor coupled with the bottom end of the first shutter blade, the first motor rotating the first shutter blade in a clockwise direction when the shutter is energized;

a second motor proximate the first motor and coupled with the bottom end of the second shutter blade, the second motor rotating the second shutter blade in a counterclockwise direction when the shutter is energized such that an aperture is formed between the first shutter blade and the second shutter blade when the shutter is energized;

a first spring coupled with the first shutter blade, wherein the first spring rotates the first shutter blade in a counterclockwise direction when the shutter is de-energized; and

a second spring coupled with the second shutter blade, wherein the second spring rotates the second shutter blade in a clockwise direction when the shutter is de-energized such that the aperture is closed when the shutter is de-energized.

2. The safety shutter of claim 1, wherein in the first motor and the second motor are stepper motors.

3. The safety shutter of claim 1, wherein in the first motor and the second motor are DC motors.

4. The safety shutter of claim 1, wherein in the first motor and the second motor are solenoids.

5. The safety shutter of claim 4, further comprising:

a first shaft within the first motor;

a first rotating plate coupled with the first shaft, wherein the first shutter blade is secured to the first rotating plate;

a second shaft within the second motor; and

a second rotating plate coupled with the second shaft, wherein the second shutter blade is secured to the second rotating plate.

6. The safety shutter of claim 1, wherein in the first shutter blade and the second shutter blade are reflective.

7. The safety shutter of claim 1, wherein in the first shutter blade and the second shutter blade are non-reflective.

8. The safety shutter of claim 1, wherein in the first spring and the second spring are spiral springs.

9. The safety shutter of claim 1, further comprising:

a first mechanical stop, wherein the first mechanical stop prevents the first shutter blade from traveling a complete rotational revolution; and

a second mechanical stop, wherein the second mechanical stop prevents the second shutter blade from traveling a complete rotational revolution.