| 摘要 |
PROBLEM TO BE SOLVED: To rapidly radiate heat generated in an imaging device such as a CCD, so as to improve image pickup characteristic, while preventing out-of-focus in the imaging device caused by temperature change. SOLUTION: The digital camera manufactured by assembling a mirror box block 20 having a lens mount 2 to which a photographic lens is mounted, and a CCD block 30 having an imaging surface for picking up an object image on a main frame 10, is constituted so that the CCD block 30 may be supported on a back plate 11 by making a supporting member 14 thermally expanded intervene in an optical axis direction, and also the value of the ratio of the dimension in the optical axis direction of the mirror box block 20 from the lens mount 2 to the back plate 11 to that of the supporting member 14 may nearly coincide with the value of the ratio of the linear expansion coefficient of the supporting member 14 to that of the mirror box block 20. By making positional variation lengthΔL1 andΔL2 caused by the thermal expansion of the lens mount 2 and the imaging surface of the CCD equal, the out-of-focus in the CCD is prevented. COPYRIGHT: (C)2005,JPO&NCIPI |
