| 摘要 |
Provided is an optical information read-in device, comprising: a light projection system (3) which projects light from light sources (30) upon a barcode, etc., by light projection lenses (31, 32); and a photoreceptor system (4) which receives reflected light upon an image capture element (40) by a photoreceptor lens (41). The light projection system (3) projects light (Lf) in a band-shaped range which is long in a prescribed direction in a light projection plane (S) which is approximately orthogonal to an optical axis (X) of the photoreceptor lens (41), and which is narrow in a width direction which is approximately orthogonal to the longitudinal direction thereof. Entry surfaces (31a, 32a) of the light projection lenses (31, 32) form uniform depression shapes in the longitudinal direction, and form uniform protrusion shapes in the width direction. Meanwhile, emission surfaces (31b, 32b) thereof form free-form surfaces so as to form a prescribed light quantity distribution in the longitudinal direction of the light projection plane (S). |
