CN1154492A

CN1154492A - Inclination angle sensing apparatus for use in projector

Info

Publication number: CN1154492A
Application number: CN95117509A
Authority: CN
Inventors: 蔡松
Original assignee: Daewoo Electronics Co Ltd
Current assignee: Daiwoo Electronics Co., Ltd.
Priority date: 1994-11-11
Filing date: 1995-11-13
Publication date: 1997-07-16
Anticipated expiration: 2015-11-13
Also published as: CN1050203C; KR0128997Y1; KR960019515U

Abstract

An inclination angle sensing apparatus for use in a projector includes a plurality of inclination angle sensing devices. In the inclination angle sensing device, the moving member is coupled to the rack and the sensor pinion is engaged with the rack. The sensor pinion has a reflector consisting of a light transmitting and a light reflecting portions, and the optical sensing unit has a portion for emitting a light beam to the reflector on the sensor pinion and a portion for receiving the light beam therefrom. The optical sensing unit determines the amount of rotation the sensor pinion has undergone by the receiving portion thereof counting the number of times the light beam encounters the light transmitting or the light reflecting slices of the sensor pinions during the rotation.

Description

The inclination angle sensing apparatus of projector

The present invention relates to projector, particularly a kind ofly be arranged in projector and can detect the device of projector automatically with respect to the angle of inclination on the plane at its place.

In general, the optical axis normal to screen of the projection lens by making projector just can make projector project that image has no distortion on the screen.But, unless projector by permanently fixing more or less, otherwise, the optical axis of projector and projection lens wherein usually can be set up in one plane like this, promptly there is an angle of inclination in regular meeting between this optical axis and plane.In other words, the optical axis of the projection lens of projector is likely and is not orthogonal to screen that this has just caused the generation of the deformation of image on the screen.

Figure 1A and 1B show a kind of with the projector of perfect condition setting and the projector that is provided with heeling condition respectively, and wherein optical axis 4 normals to screen 5 latter's of the projection lens 3 of the former projector 2 optical axis then is not orthogonal to screen 5.Fig. 2 shows the image that projects under top two kinds of situations on the screen 5.

When optical axis 4 normals to screen 5 of the projection lens 3 of projector shown in Figure 1A 2, an image 6 that does not have distortion displays, shown in solid line among Fig. 2.But when projector 2 is tilted when being provided with, promptly during plane 1 one-tenth tiltangle at projector 2 and its place, shown in Figure 1B, because this tiltangle, the image 7 that is presented on the screen 5 is out of shape, as shown in phantom in Figure 2.

A kind of circuit that is used to proofread and correct the deformation of image that produces because of inclination is disclosed in Japanese Patent Application Publication 4-323979 (on November 13rd, 1992 is open).But, in the document, Yi Bian Yi Bian the user needs directly to see that the image on the screen checks the distortion of image.

Therefore, fundamental purpose of the present invention is to propose a kind ofly to be used for projector and device that can detect the tilt angle theta between projector and its plane, place automatically.

The present invention propose a kind of like this be used for projector and can detect automatically projector with respect to its the plane between the device at angle of inclination, it is characterized in that, described device is positioned at the bottom of described projector and further comprises a plurality of angle of inclination testing agency, described projector is provided with a plurality of identical jacks and the guidance device of the described angle of inclination of guiding testing agency motion, all jacks all are positioned at the bottom of described projector, each guidance device all extends upward from a described jack, wherein, each angle of inclination testing agency comprises:

Moving member with top and bottom and a bindiny mechanism, wherein, described moving member is inserted in the jack and can be longitudinally moved by corresponding described guidance device guiding, and the bottom of described moving member contacts with described plane;

Longitudinally be fixed on the elastic component between the bindiny mechanism of described guidance device and moving member, when described projector was moved away from described plane, described elastic component provided elastic force to make described moving member can return its initial position;

Be contained in the tooth bar on described moving member top;

The idling gear that has first rotating shaft and mesh with described tooth bar;

Rotary detection of gear when being along the longitudinal movement with described tooth bar engagement and the tooth bar on being contained in described moving member, described detection of gear further comprises a reflecting element and one second rotating shaft, and wherein said reflecting element is made of transmittance section and the light-reflecting portion that the even number size equates;

A pair of fixture, described fixture is to stretching out from a longitudinal component, this longitudinal component is vertical with the basal surface of described projector, each fixture all has an inside surface, outside surface and pair of holes, and wherein said hole is used for matching with first and second rotating shafts of described idling gear and detection of gear respectively;

Be attached to the circuitry substrate on the inside surface of described fixed bar;

Be positioned at the optical detection unit on the described circuitry substrate, described unit further has the luminous component and the receiving unit that is used to receive the light beam that is reflected by described detection of gear of launching a branch of light towards described detection of gear, wherein, receiving unit by optical detection unit calculates the transmittance section of this detection of gear that light beam ran into during described detection of gear is rotated or the number of times of light-reflecting portion, the amount of spin that described detection of gear turned over is determined thus, thereby determines the angle of inclination of projector.

Above-mentioned and other purpose of the present invention and feature are by becoming more clear below in conjunction with accompanying drawing to the description of embodiment.

Figure 1A and 1B illustrate the projector and the projector that is provided with heeling condition that are provided with perfect condition respectively.

Fig. 2 shows respectively by the projector of perfect condition setting with the projector of heeling condition setting and projects image on the screen.

Fig. 3 is the sectional elevation according to an inclination angle sensing apparatus of the present invention, and at this moment, projector is for being obliquely installed.

Fig. 4 is the detailed view of a detection of gear in the inclination angle sensing apparatus of the present invention.

Fig. 5 is a partial top view, shows the matching relationship of detection of gear and an idling gear and a tooth bar in inclination angle sensing apparatus.

Fig. 3 is the sectional elevation according to device 100 of the present invention, and this device can detect its angle of inclination automatically when projector 10 is tilted placement.

This device 100 is positioned at the bottom of projector 10 and comprises a plurality of angle of inclination testing agency 200.Projector 10 is provided with a plurality of identical jacks 11 and guidance device 12, and guidance device 12 is used to guide pitch angle testing agency 200.Each guidance device 12 of bottom that each jack 11 all is positioned at projector 10 then extends on the jack 11.

For the purpose of simple and clear, below only an angle of inclination testing agency 200 of installing in 100 is elaborated.

In device 100 of the present invention, each angle of inclination testing agency 200 all comprises a moving member 20, elastic component 30, a toothed rack 40, idling gear 50, a detection of gear 60, a pair of fixture 70, circuitry substrate 80 (see figure 5) and optical detection unit 90 (see figure 5)s.

Moving member 20 has top and bottom 21,22 and comprises a bindiny mechanism 23.Moving member 20 is inserted in the jack 11 and can be along the longitudinal movement by guidance device 12 guiding, and bottom 22 contacts with plane 1.

Elastic component 30, it for example is spring, longitudinally be fixed between the bindiny mechanism 23 of guidance device 12 and moving member 20, and when projector 10 is moved from plane 1, elastic component 30 makes moving member 20 energy repositions by the elastic force that a necessity is provided, and this original position is exactly moving member 20 present positions before projector 10 is placed on the plane 1 in fact.

Tooth bar 40 is contained on the top 21 of moving member 20, and the idling gear 50 that is used for balance tooth bar 40 has one first rotating shaft 51 and is meshed with tooth bar 40.

Detection of gear 60 cooperates like this with tooth bar 40: when the tooth bar 40 on being fixed on moving member 20 was along the longitudinal movement, detection of gear 60 can be rotated.

And as shown in Figure 4, detection of gear 60 has a reflecting element 61 and one second rotating shaft 62.Reflecting element 61 is divided into the part that the even number size equates, half is arranged in these parts is transmittance section 61A, and being left half is light-reflecting portion 61B.Constituting each part of transmittance section 61A, is adjacent with two parts that constitute light-reflecting portion 61B all, and vice versa.

As shown in Figure 5, fixture stretches out from a longitudinal component 99 70, and this longitudinal component is vertical with the basal surface of projector 10.

Each fixture 70 has an inner surface and an outer surface, also has the pair of holes (not shown) simultaneously, and wherein, this is respectively applied for first and second rotating

shafts

51,62 of idling gear 50 and detection of gear 60 hole and cooperates.Vertically part 99 can be the sidewall of projector 10, also can be the side surface of the housing (end shows) that is used for coating unit 100.

Circuitry substrate 80 is contained on the inner surface of paired fixture 70.

Optical detection unit 90 is positioned on the circuitry substrate 80.And, optical detection unit 90 also have a branch of light is transmitted into the luminous component (end shows) on the reflecting element 61 of detection of gear 60 and is used to receive light beam that the reflecting element 61 from detection of gear 60 reflects accept the part (not shown).

Details are as follows for the principle of work of inclination angle sensing apparatus 100 of the present invention.

When the projector 10 that has inclination angle sensing apparatus 100 placed on the plane 1 with perfect condition, each moving member 20 all bore an equal physical force.But as shown in Figure 3, when projector 10 was provided with the state that tilts with respect to plane 1, the physical force that each moving member 20 is born was different, and this just makes moving member 20 move different distances.Therefore, it also is different being contained in the distance that each toothed rack 40 on the top 21 of moving member 20 moves, and therefore, the amount of rotating with each detection of gear 60 of a tooth bar 40 engagements also is different.

Towards a branch of light of different detection of gear 60 emissions, its receiving unit then receives the light beam that is reflected by this gear 60 to the luminous component of each optical detection unit 90 respectively.

Receiving unit by optical detection unit 90 calculates the transmittance section 61A of the detection of gear 60 that light beam ran into during the rotation of detection of gear 60 or the number of times of light-reflecting portion 61B, 60 turned amounts of spin of detection of gear just are determined, by this, can determine the angle of inclination of projector.

The angle of inclination of being determined by aforesaid way is sent to one by each circuitry substrate then and for example, proofreaies and correct with the distortion to image in the similar circuit with being disclosed in circuit among the Japanese patent application 6-189236 (open day is on July 8th, 1994).

Although the present invention illustrates and describes according to preferred embodiment,, very bright right, under the prerequisite that does not break away from appended claim, those of ordinary skill in the art can also make many variations and distortion.

Claims

1, a kind of be used for projector and can detect automatically projector with respect to its the plane between the device at angle of inclination, it is characterized in that, described device is positioned at the bottom of described projector and further comprises a plurality of angle of inclination testing agency, described projector is provided with a plurality of identical jacks and the guidance device of the described angle of inclination of guiding testing agency motion, all jacks all are positioned at the bottom of described projector, each guidance device all extends upward from a described jack, wherein, each angle of inclination testing agency comprises:

Be contained in the tooth bar on described moving member top;

2, device as claimed in claim 1, wherein, each described transmittance section is in abutting connection with two light-reflecting portion, and vice versa.

3, device as claimed in claim 1, wherein, described elastic component can be spring.