The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 29, 2019
Filed:
Feb. 09, 2012
Koji Hirata, Ibaraki, JP;
Miyuki Ikeda, Ibaraki, JP;
Tatsuya Ishikawa, Ibaraki, JP;
Hiroyuki Shinji, Ibaraki, JP;
Koji Hirata, Ibaraki, JP;
Miyuki Ikeda, Ibaraki, JP;
Tatsuya Ishikawa, Ibaraki, JP;
Hiroyuki Shinji, Ibaraki, JP;
MAXELL, LTD., Kyoto, JP;
Abstract
Provided is a projection-type image display device which by means of a projection lens () magnifies and projects an optical image formed by a light source and an image display element, wherein an error indicator () for indicating anomalies in the device is disposed on the rear surface opposite the front surface of a device housing () to which the projection lens () is attached. The projection-type image display device further includes an AC voltage monitor unit () for monitoring voltage waveforms supplied form an external power source and retaining voltage waveform data during the latest prescribed period in a memory, and reads out the voltage waveform data from the external power source retained in the memory and displays the voltage waveform data on the error indicator () as said anomalies.