| 摘要 |
PROBLEM TO BE SOLVED: To improve position accuracy of each parts and to reduce the number of parts by forming a part at least opposing to a laser chip of a laser cap of hologram with a transparent synthetic resin material and forming hologram at a transparent part of a cap. SOLUTION: A hologram laser 3 is constituted so that a chip pedestal 11 on which a laser chip 9 and a photodiode are mounted is mounted on the prescribed position of a printed board 2 and a hologram element 12 is mounted on the prescribed position of the printed board 2 so as to cover the chip pedestal 11. The hologram element 12 is made of transparent synthetic resin, and diffraction grating 14 is formed at the inside plane of one side plane of a cap body 13 of a small box type of which the lower plane is made open and a hologram 15 is formed at the outside plane. Thereby, positioning between the hologram 15 and the cap body 13 is not required, position accuracy between the hologram 15 and the cap body 13 can be improved, the number of parts can be decreased. |
