# US 5,708,490 A · Goggles for use with laser projection assembly systems

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- Number: US 5,708,490 A
- Document ID: US5708490A
- Status: Granted
- Kind: A
- Application number: 08/593,818
- Filed: 1996-01-30
- Granted: 1998-01-13
- Earliest claimed: 1996-01-30
- Assignees: Virtek Vision Corporation
- Inventors: John P. Wieczorek
- Web page: https://patentgrep.com/patent/US5708490A

## CPC

- A61F 9/022: {Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs (optical filters per se G02B5/20)}
- G02C 7/104: {having spectral characteristics for purposes other than sun-protection}
- G02C 9/02: by hinging
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00)

## Abstract

Improved goggles for use with laser projection systems allow passage of a narrow band of red wavelengths that surround the wavelength at which the laser is projecting. The goggles block adjacent wavelengths. Thus, the laser image is in contrast, and is easily seen by a wearer. At the same time, the goggles pass at least a portion of the blue and green wavelengths. Thus, the wearer is provided with an image that is not unnatural, but includes most of the natural colors. In this way, the goggles not only provide a clear image of the laser beam, but also are easily worn by a wearer for an extended period of time.

## Claims

### Claim 1

Goggles for use in viewing projected laser images comprising:
a frame for being worn by a wearer; and
a filter placed on said frame, said filter passing a first transmittance level of light in a narrow band of wavelengths adjacent to and including a projection wavelength of a laser to be utilized with said goggles, said filter passing a second transmittance level of light wavelengths within a preselected bandwidth adjacent to either side of said narrow band, and passing a third transmittance level of light at wavelengths outside of said narrow band and said preselected bandwidth, said first transmittance level being substantially greater than said third level and said third level being higher than said second level such that a user is able to view a projected laser image when wearing said goggles because said first transmittance level allows the projected image to be seen while the second transmittance level effectively blocks transmittance at said adjacent wavelengths to thereby enhance the viewability of the projected image.

### Claim 2 (depends on 1)

Goggles as recited in claim 1, wherein said laser is a red laser, and said outside wavelengths are in the blue and green visual spectrum and are generally defined by wavelengths between 400 and 580 nm, said filter passing at least a portion of said wavelengths between 400 and 580 nm.

### Claim 3 (depends on 2)

Goggles as recited in claim 2, wherein said second level is approximately zero.

### Claim 4 (depends on 2)

Goggles as recited in claim 2, wherein said third level is less than 50% of the intensity of said outside wavelengths wherein said outside wavelengths range between 400 and 580 nm.

### Claim 5 (depends on 1)

Goggles as recited in claim 1, wherein said first transmittance level is approximately 100%.

### Claim 6 (depends on 5)

Goggles as recited in claim 5, wherein said third transmittance level is less than 10%.

### Claim 7 (depends on 1)

Goggles as recited in claim 1, wherein said first level of transmittance is greater than 50%.

### Claim 8 (depends on 7)

Goggles as recited in claim 7, wherein the second level of transmittance is less than 10%.

### Claim 9 (depends on 8)

Goggles as recited in claim 8, wherein said second level is approximately zero percent transmittance.

### Claim 10 (depends on 1)

Goggles as recited in claim 1, wherein said narrow band is less than 30 nm.

### Claim 11 (depends on 10)

Goggles as recited in claim 10, wherein said narrow band is approximately 15 nm.

### Claim 12 (depends on 1)

Goggles as recited in claim 1, wherein at least one of said transmittance levels is not uniform.

### Claim 13

A method of utilizing a pair of goggles for viewing a laser projected image comprising the steps of:
(1) providing a filter designed to pass a first transmittance level of light within a narrow band of wavelengths including a wavelength associated with said laser, a second transmittance level of wavelengths within a preselected bandwidth adjacent to said narrow band, and allow passage of a third transmittance level of light at wavelengths outside of said narrow band and said preselected bandwidth, said first and third levels being higher than said second level;
(2) generating a laser image at a wavelength within said narrow band; and
(3) placing said filter between a worker and a laser image such that the worker is able to see the laser image without distortion of the image otherwise caused by light within said preselected bandwidth, and performing work based upon a laser image.

### Claim 14 (depends on 13)

A method as recited in claim 13, wherein said third transmittance level is less than 10%.

### Claim 15 (depends on 13)

A method as recited in claim 13, wherein said filter is connected to a frame of a pair of goggles.

### Claim 16 (depends on 13)

A method as recited in claim 13, wherein said laser is generated in a red wavelength within said narrow band, said preselected bandwidth includes red wavelengths, and said outside wavelengths from step (1) are within the blue and green visual spectrum.

### Claim 17

Goggles for use with a laser assembly guidance system comprising:
filters to be placed over a wearer's eyes, said filters passing a narrow band of red wavelengths at a first transmittance level, said narrow band being selected to include the wavelength of the laser to be utilized with said filters, said narrow band extending for less than 30 nm, and said filters passing wavelengths within a preselected bandwidth on either side of said narrow band at a second transmittance level which is substantially less than said first transmittance level such that a user is able to view a projected laser image when wearing said goggles because said first transmittance level allows the projected image to be seen while the second transmittance level effectively blocks transmittance at said adjacent wavelengths to thereby enhance the viewability of the projected image.

### Claim 18 (depends on 17)

Goggles as recited in claim 17, wherein said filters pass wavelengths in the blue and green visual spectrum that are outside of said narrow band and said preselected bandwidth at a third transmittance level that is higher than said second transmittance level.

### Claim 19 (depends on 18)

Goggles as recited in claim 18, wherein said first transmittance level is greater than 50%.

### Claim 20 (depends on 19)

Goggles as recited in claim 19, wherein said third level of transmittance is less than 10%.