| 摘要 |
<p>PURPOSE:To accurately control the flare of light emitted from a light source and thereby form a high-quality image without blur by providing a larger opening area on the light source side of an aperture of an exposure head than an opening area on the opposite side, and shutting off the light from a light source which does not correspond to the aperture. CONSTITUTION:In an exposure head 22, each LED chip emits light of respectively different wavelength and the emitted light passes through apertures 88, 90, 92 formed on a light shielding plate 86 respectively. After this, this light is condensed by a consensing lens 61 into an image on a photosensitive material 16, and this image is recorded as a latent image of dot pattern. The apertures 88, 90, 92 formed on the light shielding plate 86 straddle mutually adjacent LED chips and furthermore, the opening area of the LED chip side is larger than opening area of the condensing lens 61 side that is, like a frustum of pyramid, with an inner wall surface inclined by an angle theta. Therefore, the flare of light to be emitted to the photosensitive material 16 is accurately controlled and a high-quality image to be recorded is obtained.</p> |
