| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an infrared filter switching mechanism which prevents an increase in overall length of a support (holder) and has small external dimensions and a simple structure, with respect to a mechanism for switching between a dummy filter transmitting infrared rays and an infrared cut filter intercepting infrared rays in a monitoring camera lens for day and night continuous shooting. <P>SOLUTION: Switching members 6 and 7 and diaphragm members are attached to a support plate (holder) 3 provided with an aperture 2 corresponding to an imaging part. The switching members 6 and 7 cause a dummy filter transmitting infrared rays and an infrared cut filter intercepting infrared rays to switchably face the aperture 2 and make an aperture which is formed by laminating two attachment plates to which the filters for incidence and interception of infrared rays to the imaging part are attached movably in opposite directions, correspond to the aperture 2 and switch between incidence and interception of infrared rays to the imaging part by movement of the attachment plates in opposite directions. The diaphragm members extend or reduce a diaphragm aperture formed by laminating two aperture blades 4 and 5 movably in opposite directions, to adjust the quantity of light to the imaging part. <P>COPYRIGHT: (C)2013,JPO&INPIT |
