| 摘要 |
An improved transparency holder is provided for use in supporting and positioning a transparency in a light and image projection apparatus, such as a photographic enlarger. It includes a pair of opposed carrier plates having an aperture for coaxial alignment with a light beam. Disposed therein are mask means, which are another pair of opposing apertured plates for releasably holding the transparency therebetween in coaxial alignment with the light beam. The mask means are positioned by registry pin and hole means, and releasably retained thereat by magnetic means. A cassette means also defines an aperture for coaxial alignment with the light beam and is adapted to removably receive the carrier means. Moveable wedge means are externally accessible from the cassette and cooperate with the mask means for selectively releasing the transparency for movement. Bias means within the cassette compresses the mask means to hold the transparency in clamped engagement when the carrier is in the cassette.
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