| 摘要 |
PURPOSE:To save space by forming a hollow cylinder of light metal or its allow by extrusion molding, and cutting this cylinder into a frame of specific height. CONSTITUTION:The frame 15 made of Al alloy is interposed between a circuit board 16 and a mechanism chassis 17. The circuit board 16 is made of an insulating substrate and various circuit parts 18 are mounted to form a specific circuit. This circuit board 16 is coupled with a flame 15 by using screws 19. The screws 19 are screwed into grooves 12 formed at the corners of the frame 15. A rotary head drum 20 and a cassette holder 21 are fitted on the mechanism chassis 17 and coupled with the frame 15 with screws 22. Those screws 22 are also screwed into the grooves 12 of the frame 15. Consequently, the mechanism chassis 17 and mechanism frame 15 are both reduced in cost and also combined with each other to have large strength, so strength required for a VTR is secured.
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