CS271078B1 - Optical device for reading determinated for near-sighted people - Google Patents

Abstract

Optical reading apparatus comprises an object support surface 1, a microscope to view the object 21, a mirror 7 to direct the microscope field of view onto the support 1, and means for mounting the microscope and mirror 7 for pivotal movement. The microscope may comprise a wide-field eyepiece 15 with a focal length of 28 +/- 8 mm and with an angle of over 60 DEG for the field of vision, the distance from the exit pupil to the vertex of the entry-side ocular surface being about 15 mm. By altering the distance between the eyepiece 15 and the objective 11 and microscope magnification can be adjusted within the range 4-8 x. An adjustable pair of mirrors 13, 14 forming an apex structure may be provided in the vicinity of the intermediate image 22 plane as image erection means. When the optical part of the apparatus is tilted about a horizontal axis a lever gear 8, 10 ensures that by the aid of a deviating mirror 7 close to the object the optical axis is kept perpendicular to the plane of the object. By the use of one single handle 20 tilting movements for adaption to the object and also pivoting movements can be carried out. <IMAGE>

Description

1,271,078

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Claims (1)

OBJECT OF THE INVENTION An optical reading device for visually impaired, comprising, as an optical part, a microscope directing the reverse image with a small, predominantly 4 to 8-fold magnification, a broken beam and a free object space greater than 150 mm. wherein the regulated distance. necessary for precise focusing to the object holder is created by turning the optical part of the device around the horizontal axis. mounted on a support stand indicating sowing. that a deflection mirror <7) is positioned and directed to the object (21) in front of the objective lens (11). the position of which is controlled depending on the rotation of the optical portion of the apparatus by a trapezoidal lever transmission with a length ratio of short sides / 7 * -9 to 4-9 / 2 = 1, thereby optimizing the axis intersecting the location of the object (21) always remains vertical in relation to its plane. 2 drawings r