Optics: image projectors – Miscellaneous
Reexamination Certificate
1999-03-30
2002-02-12
Dowling, William (Department: 2851)
Optics: image projectors
Miscellaneous
Reexamination Certificate
active
06345897
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to a projection display device, controllable by a remote controller, which comprises a light source, an optical system for forming an optical image in accordance with image information as a result of optically processing light beams emitted from the light source, a projection lens for projecting the optical image in enlarged form, and a remote controller for controlling the projection display device.
2. Description of Related Art
A hitherto known projection display device, which can be controlled by a remote controller, includes a light source, an optical system for forming an optical image in accordance with image information as a result of optically processing light beams emitted from the light source, and a projection lens for projecting the optical image in enlarged form.
Such a projection display device is used in front of many people, for example, of academic societies, or at conferences or exhibitions. When, for example, a computer is connected to the projection display device in order to display the image on the computer in enlarged form, multimedia presentations can be performed. The presenter explains what is on the display screen by operating a remote controller. The remote controller includes various buttons, for example, that a laser pointer button used for specifying the location where the information or image to be explained is displayed on the display screen; a pointer operation button for operating a mouse pointer on the computer; and various adjuster buttons for adjusting the display screen according to the circumstances, such as a zoom adjuster button, a focus adjuster button, a power supply switch button, and an image adjuster button.
However, when a presenter explains what is on the display screen using such a remote controller, the presenter explains it primarily by looking at the display screen, so that he may inadvertently press an incorrect adjuster button. Therefore, it is desirable to restrict the functions that can be adjusted by the use of the remote controller to the minimum number required, so that even when a button is pressed an unnecessary function is not executed.
When there is more than one person making presentations for academic societies or at exhibitions, the zooming adjusting function and the focusing adjusting function are rarely adjusted again, once they are set. Therefore, it is desirable to restrict the zooming adjusting function and the focusing adjusting function so that incorrect operations of the zoom adjust button and the focus adjuster button do not occur.
Similarly with the remote controller, the above-described projection display device has a body side power supply switch button, for turning on/off the switches of the projection display device, and buttons for adjusting what is on the display screen, that is a body side zoom adjuster button, a body side focus adjuster button, a body side image adjuster button, and the like. When explaining what is on the display screen by using a remote controller, it may be better to restrict the body side adjusting functions in order to prevent an outsider from incorrectly operating the control.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a projection display device and a remote controller which are not affected even when an outsider incorrectly operates any one of the adjuster buttons on the remote controller or on the projection display device body.
To this end, according to an aspect of the present invention, there is provided a projection display device controllable by a remote controller, the projection display device including a light source, an optical system for forming an optical image in accordance with image information as a result of optically processing light beams emitted from the light source, and a projection lens for projecting the optical image in enlarged form, the projection display device comprising a power supply switch restricting system for restricting a function of a power supply switch portion of the remote controller which causes a power supply to be turned on/off.
Here, a conventionally known type of circuit may be used for the power supply switch restricting system. The conventionally known type circuit does not receive a signal, which is provided from the remote controller in order to turn the power supply switch on or off, even when such a signal is input into the projection display device.
For example, the power supply switch restricting system can be formed by a circuit including a switching element which electrically connects or disconnects the light-receiving portion for receiving light from the remote controller with the power supply switching circuit of the projection display device. In another example, the power supply switch restricting system can be formed such that the type of light signal that the light-receiving portion receives from the remote controller can be selected at a signal processing circuit forming the light receiving portion.
According to this aspect, the power supply device is provided with a power supply switch restricting system which can restrict a function of the power supply switch portion on the remote controller. Therefore, when this function of the remote controller is controlled, the power supply of the projection display device will not be cut off, even when the presenter using the projection display device inadvertently operates the power supply switch portion on the remote controller incorrectly.
In this aspect, switching between the restricting states of the power supply switch restricting system may be performed by (a) using a setting screen displaying system, which is provided at the body of the projection display device, in order to show a setting screen used to set the projection display device, and performing selection of menu on the setting screen, or by (b) using a switch, which is provided at the body of the projection display device, and specifically designed for switching the restricting state of the power supply switch restricting system.
When switching between the restricting states is performed using a setting screen in the projection display device, the restricting state can be displayed on the screen, so that the setting of the restricting state of the remote controller can be confirmed by more than one person. In case that restricting is performed using a specifically designed switch, if the restricting state of the power supply switch restricting system is set at the projection display device body, the restricting state cannot be switched using the remote controller. Therefore, even when the remote controller is used by a large and an unspecified number of persons, such as while making a presentation for an academic society, confusion owing to the accidental changes of the restricting state will not arise.
According to another aspect of the present invention, there is provided a projection display device controllable by a remote controller, the projection display device including a light source, an optical system for forming an optical image in accordance with image information as a result of optically processing light beams emitted from the light source, and a projection lens for projecting the optical image in enlarged form, the projection display device comprising a zooming/focusing adjusting function restricting system for restricting a function of a zooming adjusting portion, for performing zooming adjustments on the projection lens, of the remote controller, and/or for restricting a function of a focusing adjusting portion, for performing focusing adjustments on the projection lens, of the remote controller.
According to this aspect, the zooming/focusing adjusting function restricting system allows the function of the zooming adjusting portion and/or the function of the focusing adjusting portion to be restricted, so that, as in the case where the power supply switch restricting system is used, when the zooming adjusting portion function and/or the focusing adjusting portion
Dowling William
Oliff & Berridg,e PLC
Seiko Epson Corporation
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