JPH0527153A - Optical equipment - Google Patents

Abstract

PURPOSE:To facilitate operation and handling by detecting the motion of a device by an acceleration sensor and automatically performing automatic focusing operation when it is judged that the device is moved. CONSTITUTION:When a lamp switch 3 is closed, a system is reset and the automatic focusing operation is performed. It is judged from the output of a range finder 12 whether an in-focus state is obtained or not and when so, the operation of the acceleration sensor 13 is stopped. When not, on the other hand, a system controller 16 performs arithmetic based upon the output of the acceleration sensor 13 or outputs the driving direction and quantity of a projection lens to a focusing driving part 15 according to data stored previously in the system controller 16; and a focusing mechanism 11 is driven and controlled to drive the projection lens to a focusing position, where the range finder 12 is stopped. Therefore, the system controller 16 detects the outputs of the focus switch 4 and acceleration sensor 13 throughout the operation of a projection device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has an automatic focusing device.
Alternatively, it relates to an optical device having an automatic focusing function.

[0002]

2. Description of the Related Art Conventionally, a projection apparatus having a built-in automatic focusing device has been known as a type of optical equipment.
There is one described in Japanese Patent Publication No. 204010. The invention according to this application simplifies the operation of a projection device equipped with an automatic focusing device, and performs automatic focusing by detecting installation of the projection device.

[0003]

However, after the above-mentioned projection device is once installed, it is necessary to manually activate the focusing operation when a person touches it and moves it. Therefore, the operation and the handling are troublesome. The automation was inadequate.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an improved optical apparatus (projection apparatus) which does not require manual activation of the focusing apparatus and is easy to handle.

[0005]

DISCLOSURE OF THE INVENTION The present invention aims to achieve a higher degree of automation in the projection apparatus according to the present invention, in which the apparatus is moved, including installation of the apparatus. In addition, AF is detected by detecting vibration.
It is characterized in that the operation and handling of the projection device are facilitated by performing the (automatic focusing operation).

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A projection apparatus as an embodiment of the optical apparatus of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic view showing an embodiment of the present invention.

In the figure, reference numeral 1 is a casing, and four legs 2 are provided.
Is attached. Reference numeral 3 is a lamp switch arranged in the casing 1, and 4 is a focus switch arranged in the casing 1. Reference numeral 5 denotes a light source lamp for projecting an image. Reference numeral 6 is a reflector, 7 is a condenser lens, and 8 is a heatproof filter. Reference numeral 9 is a transmissive liquid crystal display. A projection lens 10 is a focusing mechanism 11
Is attached to. Reference numeral 12 denotes a distance measuring device, which is based on the well-known triangulation principle used in a camera, projects infrared light, detects reflected light from an object with a light receiving element, and detects It measures distance. An acceleration sensor 13 outputs a signal according to the acceleration applied to the projection device. 14 is a screen.

Next, the operation will be described.

When the lamp switch 3 is closed, the lamp 5
Lights up, and substantially parallel light rays enter the liquid crystal display 9 by the reflector 6 and the condenser lens 7. The heat-proof filter 8 cuts infrared light and prevents the liquid crystal display 9 from being deteriorated by heat. The liquid crystal display 9 displays a television image when supplied with a video signal. The projection lens 10 forms an image on the screen 14 by the liquid crystal display 9. The projection lens 10 is attached to the focusing mechanism 11, and is driven in the optical axis direction by a signal from the distance measuring device 12,
The image is displayed on the screen 14 even if the distance from the screen changes.
It is designed to form an image on the top. By manually closing the focus switch 4, a person who operates it can operate the focusing mechanism at any timing. The acceleration sensor 13 is fixed to the casing 1 and detects the applied acceleration. Recently, an ultra-compact sensor has been developed which attaches a weight to the tip of a piezoelectric element and detects the acceleration by the voltage generated when the piezoelectric element is bent by the acceleration, which is convenient to use.

FIG. 2 is a block diagram showing a main part of the present invention, showing a part relating to the operation of AF. In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals. 1
Reference numeral 5 denotes a focusing drive section which is an electric circuit section for driving and controlling the focusing mechanism 11. Reference numeral 16 is a system controller that controls all the systems in the projection apparatus.

FIG. 3 is a flowchart showing the operation of AF. When the lamp switch 3 is closed, the system is reset (# 1) and the AF operation is performed (# 2).
It is determined from the output of the distance measuring device 12 whether or not the focus is achieved (#
2-1) In the case of focusing, the operation of the distance measuring device 13 is stopped. This makes it possible to reduce power consumption. When the focus is not in focus, the system controller 16 calculates from the output of the distance measuring device 13, or the drive direction and drive amount of the projection lens 10 are set to the focus drive section 15 based on the data stored in advance in the system controller 16. Then, the focusing mechanism 11 is driven and controlled to drive the projection lens to the focusing position (# 2-2), and the distance measuring device 12 is stopped. The system controller 16 constantly detects the outputs of the focus switch 4 and the acceleration sensor 13 during operation of the projection device (# 3, # 4). When the focus switch 4 is closed by the operator's intention, the process branches to # 5 in the flowchart, and the same AF operation as described above is performed.
If the device is accidentally moved while the projection device is operating, or if the device is moved to change the place or change the size of the screen, the output of the acceleration sensor 13 becomes equal to or higher than a predetermined value. Then, the flow branches to # 5 and the AF operation is performed.

[0013]

As described above, in the projection apparatus of the present invention, the movement of the apparatus is detected by the acceleration sensor, and AF is automatically performed when it is determined that the apparatus has moved. There is no need at all.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a projection device according to the present invention.

FIG. 2 is a schematic diagram showing an electrical configuration of the apparatus shown in FIG.

FIG. 3 is a flowchart of an operation performed in the configuration of FIG.

[Explanation of symbols]

1 ... Casing 3 ... Lamp switch 4 ... Focus switch 5 ... Lamp 6 ... Reflector 7 ... Condenser lens 9 ... Liquid crystal display 10 ... Projection lens 11 ... Focusing mechanism 12 ... Distance measuring device 13 ... Acceleration sensor 15 ... Focusing drive unit 16 … System controller

Claims (1)

Claim: What is claimed is: 1. In an optical device having an automatic focusing device, an acceleration detecting device for detecting an acceleration acting on the optical device, and a detection output of the acceleration detecting device is a predetermined value or more. An optical device comprising: a control unit that causes the automatic focusing device to perform an automatic focusing operation.