A metal structure (101) having a substantially U-letter shape is provided
in a chassis. Tripod screw attaching portions (102a) are provided to the
upper and lower portions of the metal structure. A casing is arranged to
cover the front surface of the front portion and the lower surface of the
rear portion of the metal structure (101). A metal chassis panel (105,
106) is attached to cover at least the left and right surfaces of the
metal structure. The casing portion of the front surface of the metal
structure is substantially curved to enable tally lamp light to be
recognized at the casing portion of the front surface.