Abstract:
PROBLEM TO BE SOLVED: To provide a spectroscopic unit.SOLUTION: The spectroscopic unit includes a body and a light condensing part. The light condensing part is located on the body, and includes a first light incident surface, and a second light incident surface which is discontinuously adjacent to the first light incident surface.
Abstract:
PROBLEM TO BE SOLVED: To provide a laser irradiation apparatus capable of emitting light having a stabilized intensity from a laser light source.SOLUTION: The laser irradiation apparatus comprises: a laser light source 1; a mirror 3 which reflects a part of light Lemitted from the laser light source 1 and transmits the residue; a photodetector 4 which detects reflection light L, Lfrom the mirror 3; and a feedback control circuit 5 which receives a signal output from the photodetector 4 and controls the output of the laser light source 1 so as to maintain a constant signal strength. Thickness of the mirror 3 is set so that an interval S of a beam spot on the photodetector 4 of the reflection light Lreflected on the front surface of the mirror 3 and a beam spot on the photodetector 4 of the reflection light Lreflected on the back surface of the mirror 3 is equal to or greater than a predetermined value.
Abstract:
PROBLEM TO BE SOLVED: To provide a display device that easily changes a position of a virtual image that is displayed by an image display device.SOLUTION: A display device includes a glasses-shaped frame 10 worn by an observer on his/her head, and an image display device attached to the frame 10. The image display device includes an image forming device and an optical device, and the frame 10 consists of a front part 11, a nose pad 80, and an attachment member 40 attached to the center portion of the front part 11. The optical device 120, 320 are rotatably attached to the attachment member 40 with an axis line parallel to a direction that connects the center of both eyeballs of the observer as the center. The nose pad 80 is attached to the attachment member 40 movably in a vertical direction.