Bizarre Patents
Wearable Device For Feeding and Observing Birds and Other Flying Animals
A device for feeding and observing flying animals comprising a hat, a support mounted on the hat and extending outward from the hat, and a feeder mounted on the support.
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| Number | Title | Issue Date |
| 5883741 | Optical head device and birefringent diffraction grating polarizer and polarizing hologram element used therein An optical head device uses a birefringent diffraction grating polarizer configured in a reflection type. The device includes a polarizing hologram element which reflects the light from a light source to a converging lens system and diffracts the polarize... | 03/16/1999 |
| 5659531 | Optical head device and birefringent diffraction grating polarizer and polarizing hologram element used therein An optical head device uses a birefringent diffraction grating polarizer configured in a reflection type. The device includes a polarizing hologram element which reflects the light from a light source to a converging lens system and diffracts the polarize... | 08/19/1997 |
| 5636049 | Mechanism for scanning the inner periphery of a drum included in an image forming apparatus In an image forming apparatus, a mechanism for scanning the inner periphery of a hollow cylindrical drum has stationary optics including two semiconductor lasers fixed in place. The two lasers have their p-n junction planes positioned perpendicular to eac... | 06/03/1997 |
| 5535055 | Optical head device and birefringent diffraction grating polarizer and polarizing hologram element used therein An optical head device uses a birefringent diffraction grating polarizer configured in a reflection type. The device includes a polarizing hologram element which reflects the light from a light source to a converging lens system and diffracts the polarize... | 07/09/1996 |
| 5493555 | Optical head using birefringent diffraction grating A light radiated from a light source is focused on an optical disc by a focusing lens. A light reflected from the optical disc is introduced to a signal detection system. In the signal detection system, the introduced light is diffracted by a birefringent... | 02/20/1996 |
| 5446290 | Fingerprint image input device having an image sensor with openings A two-dimensional image sensor 12 having openings 28 through which light can pass is formed on a transparent substrate 21 and combined with a planar light source 11 and an optical element 13 which defines optical paths. The optical element 13 is formed by... | 08/29/1995 |
| 5336875 | Method and arrangement of generating a non-diffractive beam at a location which is remote from optical element and application thereof In order to generate a Bessel beam at a location remote from an optical arrangement, the optical arrangement includes, a first beam converging element which is illuminated by a collimated beam, a second beam converging element which is illuminated by a be... | 08/09/1994 |
| 5270996 | Optical head with diffraction grating producing five diffracted detection light beams An optical head comprises a grating lens for diffracting light beam separated from the light beam path. The grating lens is composed of a plurality of regions having different focal length and diffraction direction so that the light beam is divided into a... | 12/14/1993 |
| 5267083 | Lens system for optical reader First to third lenses are arranged in order to have a common optical axis. The first and second lenses provide a combined lens structure for shifting an object point along the common optical axis by moving one of the first and second lenses along the comm... | 11/30/1993 |
| 5036504 | Optical head using a reflection grating An optical head includes a reflection type grating lens for dividing specified polarized lights into a reflected light and a diffracted light, a device for detecting a RF signal from the reflected light of the grating lens, and a device for detecting focu... | 07/30/1991 |
| 4945529 | Optical head comprising a diffraction grating for directing two or more diffracted beams to optical detectors For use in combination with an optical source for generating a coherent beam along a main optical axis, an optical head device comprises a diffraction grating having a plurality of grating regions which are responsive to the coherent beam for directing a ... | 07/31/1990 |
| 4842824 | Optical storage medium An optical storage medium comprises a thermoplastic resin substrate having a concave and convex surface grating on one surface thereof, and a metal layer covering the concave and convex surface grating. The period of the concave and convex surface grating... | 06/27/1989 |
| 4753502 | Holographic laser beam scanner A laser beam scanner that includes a laser source emitting light at a frequency (X2) and a rotatable hologram produced by interfering lasers at a frequency (X1) and located a distance (a) from the laser source and a scanned surface a... | 06/28/1988 |
| 4689481 | Focus error detector and optical head using the same A focus error detector for an optical head utilizes a transmission type diffraction grating and an optical system for converging a beam issuing from a light source onto an object and converting light reflected from the object to a collimated beam to cause... | 08/25/1987 |
| 4378142 | Hologram made by using a plurality of spherical waves and a device for laser beam scanning by using the hologram A hologram is manufactured by making a plurality of coherent spherical-wave beams, N (ࣙ3) in number, interfere with one after another to provide a multiplicity of interference fringe configurations. A phase subtract aspheric-wave is produced by an auxil... | 03/29/1983 |
| 4299437 | Coherent beam scanner having a planar hologram illuminated by a convergent or divergent beam A coherent beam scanner provides a scan along a straight line by using a linearly moving planar hologram illuminated with a convergent or divergent beam. The hologram is formed by a first beam divergent from a first point on one side of the hologram and a... | 11/10/1981 |
