Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1994-12-02
2001-08-14
Brier, Jeffery (Department: 2672)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C396S281000
Reexamination Certificate
active
06275212
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to display devices in which pointers are used and, more particularly, to display devices which use rotary pointers driven by stepping motors and which are particularly suitable for cameras.
2. Description of the Related Art
Conventionally stepping motors are used as drive sources for the hands of clocks and other pointer devices because they are small and have high reliability. In addition, they are inexpensive because they are manufactured in very large quantities, and are used as drive sources for many types of display devices.
However, resetting can be a problem in clocks and other display devices driven by stepping motors where several pointers are above the same face, particularly when one or more hands are used in a stopwatch function. If the starting point position of the pointers becomes displaced, due to faulty drive or due to battery exchange, it was heretofore very troublesome to use stepping motors to rotate the pointers to reset the starting point positions of the individual pointers.
In some clocks, this problem was solved by applying mechanical limiting members to bring about rotation of the hands. This enables the set values of some physical quantities and measuring values to be reset to the starting point position after battery exchange. However, due to the arrangement of components, positioning space cannot be provided for mechanical limiting members in small apparatus, such as cameras.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a pointer type display device which automatically adjusts the starting point position of the pointer, when set display and measured display are caused to display after batteries are exchanged and when there is a pointer drive processing error.
It is also an object of the present invention to provide a display device with which an accurate display is possible using simple hardware and software control for the operation of a camera.
It is a further object of the present invention to provide a display of a camera having a necessary and sufficient response speed.
Objects of the present invention are achieved by providing a display device comprising a display to indicate physical quantities by pointers moving over a scale plate; a display driver to drive the pointers; operator controls to change the physical quantities displayed by the display in response to manipulation by an operator; an electrical supply detector to generate a voltage change signal upon detection of at least one of battery exchange and an electrical supply voltage below a predetermined voltage; a memory to store movement information representative of the physical quantities displayed by the display; and a controller to control driving of the display by the display driver in response to the manipulation of the operator controls and storing of the movement information in the memory, and after the voltage change signal is generated, to control the driving of the pointers in the display to positions based on the movement information stored in the memory.
Objects of the present invention are also achieved by providing a display to display information by pointers moving over a scale plate; a display driver to drive the pointers; operator controls to produce operation signals indicating changes to the information displayed by the display in response to manipulation by an operator; at least one measuring device to generate measurement signals based on measurements of physical quantities; and a main controller to set movement destinations of the pointers based on at least one of the operation signals and the measurement signals and to output instruction signals representing a movement procedure for the pointers to reach the movement destinations, the display driver driving the pointers of the display based on the instruction signals.
REFERENCES:
patent: 5195062 (1993-03-01), Sase et al.
patent: 5365292 (1994-11-01), Wakabayashi et al.
patent: 5506651 (1996-04-01), Tsujahara et al.
Higaki Riichi
Iida Yoshikazu
Iwane Yukikazu
Ohtani Tadashi
Tsukahara Daiki
Brier Jeffery
Nikon Corporation
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