| 摘要 |
A single-lens-reflex camera includes means for virtually eliminating vibration, noise, and motion caused by mirror movement, resulting in a higher resolution image being recorded on a light-sensitive surface at the rear of the camera. A pair of bi-parting mirrors are smoothly and noiselessly slid from a position adjacent each other, reflecting an image upward to a viewing screen for focusing and viewing, to a separated position. When mirrors are separated they are clear of the image, so the image can then fall upon the shutter and light-sensitive surface at the rear of the camera. After the image is recorded on the light-sensitive surface, the mirrors return to their original adjacent position. The mirrors are symmetrically arranged, so their inertial masses oppose and cancel each other during mirror movement, thereby eliminating camera movement from this source. This allows larger and heavier mirrors to be used in large format cameras. Space does not have to be allowed for the arc of a pivoted mirror to clear the objective lens, so the camera body can be reduced in size, and a larger mirror can be used. The mechanism for the mirror moving means is simple and rugged. Most usual camera features can be incorporated into a camera utilizing this system. The quietness of this mirror moving means makes its use advantageous for cameras used in wildlife and candid photography.
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