| 摘要 |
1,101,234. Comparison photo-meters. INTERNATIONAL POLAROID CORPORATION. April 12, 1965 [April 13, 1964], No. 15482/65. Heading G1P. [Also in Division G2] A comparison photo-meter comprises a lamp 17 energized through a switch 57, 64, a photometer head 13 for comparing the brightness of a second light-source 14 with that of the lamp, manual means to change the relative brightness of the light-sources, and second means responsive to manual operation of the first means for closing the switch. A rotatable actuator 29, Fig. 2 having a knob 30 may constitute the first and second means. Rotation of the knob, varies photo-meter aperture 33, and exposure aperture 34 defined by blades 25, 26 actuated by a cam 31 on a shaft 43. Contact 57 of the switch 57, 64 is engaged by portion 52 of knob 30 to close the switch up on relative axial movement of the shaft 43 and knob 30, thereby energizing lamp 17 to permit adjustment of the diaphragm opening to achieve photo-metric balance. Camera shutter Fig. 5 (not shown) has a blade (71) pivotally mounted at (72) on shutter plate (73). Blade (71) has an aperture (74) normally out of alignment with fixed exposure aperture (23). The aperture (74) is moved into alignment with aperture (23) by a pin (76) extending through slot (77) in plate (73). A yoke (78) having a flange (79) engaging shaft (43) is pivotally attached to pin 76. Axial movement of knob (30) from its normal position Fig. 3 (not shown), to its operative position of Fig. 6 (not shown) causes plate (71) and a shutter blade (80) pivoted thereto to pivot to the broken line position, Fig. 5 (not shown). Flash synchronization is provided by a switch (87) actuated by arm (84) on shutter blade (80). |
