Title:
OPTOMETRY DEVICE
Document Type and Number:
Japanese Patent JP2750512
Kind Code:
B2
Abstract:
PURPOSE: To apply masking to a target at the center section of a screen and minimize the number of masks by controlling a driving means to move the selected presentation target nearly to the center of the screen based on the detection by a target detecting means and the signal of a target selecting means.
CONSTITUTION: When an eyechart roll film 2 is unwound on an eyechart upper roller and a mark is detected by an eyechart film initial position detecting photoelectric switch 14A, the photoelectric switch 14A is turned off, and the eyechart roll film 2 is set to the start position. The signal constituent digitized with the infrared signal from a remote control 46 from the infrared modulation light in a light receiving preamplifier 45 and a detecting circuit 44 is extracted, and the command signal for presenting the target corresponding to the signal constituent is generated in a CPU 40, a RAM 41, and a ROM 42. The command signal drives an eyechart upper pulse motor 16 via an input/output circuit 43, and the target to be presented is moved nearly to the center of a screen.
Inventors:
HAYASHI AKIHIRO
MIMURA YOSHIAKI
MIMURA YOSHIAKI
Application Number:
JP13279895A
Publication Date:
May 13, 1998
Filing Date:
May 02, 1995
Export Citation:
Assignee:
NIDETSUKU KK
International Classes:
A61B3/028; (IPC1-7): A61B3/028
Domestic Patent References:
| JP5938904U |
Other References:
【文献】新眼鏡学講座(日本眼衛生協会、昭38.3.15発行)
【文献】「TOKO CHART PROJECTOR 東光視力表投映機」の取り扱い説明書
【文献】眼鏡総合専門雑誌「眼鏡」(眼鏡光学出版株式会社、昭59.3.15発行)
【文献】「TOKO CHART PROJECTOR 東光視力表投映機」の取り扱い説明書
【文献】眼鏡総合専門雑誌「眼鏡」(眼鏡光学出版株式会社、昭59.3.15発行)