| 摘要 |
An optical head (41) comprises first and second members (51, 61) and a tubular member (71). First to fifth holes (52-56) are so formed continuously in the first member (51) as to extend therethrough. Sixth to eighth holes (62-64) are so formed continuously in the second member (61) as to extend therethrough. The second member (61) is inserted into the fifth hole (56) and secured. A semiconductor light- emitting device (23) is inserted into the sixth hole (62). The tubular member (71) has first and second tubular portions (72, 73) and is inserted in the fourth hole (55). A lens (27) is secured between a step portion formed in the border between the second and third holes (53, 54) and the first tubular portion (72). A beam-shaping member (25) is secured between a step portion formed in the border between the fourth and fifth holes (55, 56) and the second member (61).
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