JP2006171169A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the lens cap of a projector from being lost, and to prevent the lens cap from hindering the setting of the projector. <P>SOLUTION: The projector has the lens cap 3 for opening or closing the light inlet port 21 of a lens cylinder 2. In the projector, the light inlet port 21 of the lens cylinder is vertically sectioned into two, with one being an effective flood lighting region Z1, located on the upper side and the other a nonuse region Z2 located on the lower side. At least part of the nonuse area Z2 is covered with a shielding part 22. The lens cap 3 for opening or closing the effective flood lighting region Z1 is connected to the upper end edge of the shielding part 22 via a resin hinge 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector, and more particularly to a projector including a lens cap that is attached to and detached from a light projection port of a lens tube.

  Conventionally, some lens caps that are attached to and detached from the lens barrel of a projector are handled only by the lens cap, but this is a matter of great care and interest in managing the lens cap removed from the Linds barrel. If you did not pay, there was a risk of losing. Also, even if the lens cap is connected to the projector with a string, and the lens cap is removed from the lens tube when the projector is in use, the lens cap remains connected to the lens tube with the string to prevent its loss. Some of them were made.

  On the other hand, in order to prevent the lens cap from being lost, there has been known a technique in which the lens cap is connected to a ring having a screw attached to the lens hood with a hinge made of a bending resistant plastic (see Patent Document 1). ). It has also been conventionally known that a lens cap is connected to a mounting member attached to a lens barrel of a camera via a mechanical hinge or a resin hinge (see Patent Document 2, Patent Document 3, and Patent Document 4). .

Further, the projector housing is divided into a first housing provided with a projection lens and a second housing connected to the first housing via a hinge part so as to be opened and closed, and the projection lens is provided in the second housing. It has been conventionally known that the projection lens is accommodated in the projection lens accommodation recess by closing the second housing by providing the accommodation recess (see Patent Document 5).
Japanese Utility Model Publication No. 57-14128 Japanese Patent Laid-Open No. 3-157635 Japanese Utility Model Publication No. 58-71725 JP 2003-43555 A JP 2003-84367 A

  However, although the above-mentioned conventional example in which the lens cap is connected to the projector with a string can achieve the temporary purpose of preventing the loss of the lens cap, the projector is lifted up slightly to achieve a stable installation surface. When performing the installation work, etc., the lens cap that is removed from the lens tube and connected to the projector with a string is often sandwiched between the installation surface, which is very troublesome.

  Therefore, the present invention prevents the lens cap from being lost by installing the lens cap so as not to be separated from the projector, and further facilitates the handling of the lens cap when installing the projector on the installation surface. It is an object of the present invention to provide a projector that can eliminate the annoyance that a lens cap gets in the way.

  Another object of the present invention is to provide a projector in which the lens cap can be made compact by utilizing the optical characteristics of the projector.

  Furthermore, an object of the present invention is to provide a projector that allows manual adjustment of an adjustment ring for adjusting focus or zoom provided in a lens tube to be easily performed using a lens cap. .

  In the projector according to the present invention, in the projector including a lens cap for opening and closing the light projection opening of the lens cylinder, the lens cap is connected to the lens cylinder via a resin hinge. With this configuration, even if the lens cap is not connected to the projector with a string, the lens cap is always handled together with the projector without being separated from the projector, so there is no room for the lens cap to be lost. The lens cap can be opened and closed without inconvenience by the action of the resin hinge.

  In the present invention, it is desirable that the lens cap is integrally formed with the lens cylinder with resin. According to this, it is easy to reduce the number of parts and reduce the cost by eliminating the trouble of separately forming the lens cap.

  In the present invention, the light projection port of the lens cylinder is divided into two upper and lower parts, an upper effective light projection area and a lower non-use area, and at least a part of the non-use area is made of resin. The lens cap that opens and closes the effective light projecting region or the effective light projecting region and the rest of the non-use region via the resin hinge is connected to the upper edge of the shield unit. It is possible to adopt the configuration of being provided. There is a DLP (digital light processing: reflection type) projector as a projector in which the light projection opening of the lens tube is divided into two upper and lower parts in an upper effective light projecting area and a lower non-use area. In this DLP projector, since the lower section of the projection opening of the lens cylinder is an unused area, even if the lower section is covered with a shielding part, there is no adverse effect on the projection performance. Therefore, by configuring as in the present invention, the lens cap can be made compact, and the opening / closing operation thereof can be easily performed.

  In the present invention, in the projector provided with the lens cap for opening and closing the light projection opening of the lens tube, the projector has the light projection opening of the lens tube in the upper effective light emission area and the lower non-use area. It is a reflection type projector divided into two vertically, and at least a part of the unused area of the lens tube is covered with a shielding part, and the effective light projecting area or the effective light projecting area is formed on the upper edge of the shielding part. The lens cap that opens and closes the remaining portion of the unused area is connected through a resin hinge, and the lens cap is integrally formed of resin together with the lens cylinder, the shielding portion, and the resin hinge. It is made more concrete by adopting.

  Another invention according to the present invention provides a projector including a lens cap for opening and closing a light projection port of a lens tube that includes an adjustment ring for manually adjusting a focus or a zoom. A mounting portion for the lens tube, and a cap body that opens and closes the light projecting port that is connected to the mounting portion by integral molding via a resin hinge. The mounting portion has a sliding resistance against the adjustment ring. A sliding part is provided.

  In this invention, although the lens cap is separated from the projector, the lens cap is handled integrally with the projector by attaching the lens cap mounting portion to the lens tube. There is no risk of loss. In addition, since the sliding portion of the lens cap mounting portion is configured to give sliding resistance to the adjustment ring provided in the lens tube, when the user manually rotates the adjustment ring, the adjustment ring Will stop exactly at the desired rotational position by the user, which helps to adjust the focus or zoom.

  In the present invention, an attachment portion fixing means for fixing the attachment portion to the lens tube is added, and the attachment portion is provided with a mark indicating a rotation position when the adjustment ring is manually rotated. It is desirable. This makes it possible to adjust the rotation of the adjustment ring using the mark on the lens cap attachment as a guideline, so it is possible to adjust the focus or zoom appropriately without actually displaying the image on the screen. become.

  According to the present invention, in a projector having a lens cap for opening and closing a light projection opening of a lens tube provided with an adjustment ring for manually adjusting the focus or zoom, the lens cap is located with respect to the lens tube. A mounting portion that is attached to a fixed position by the action of the fixing means; and a cap body that opens and closes the light projecting opening that is continuously formed by integral molding on the mounting portion via a resin hinge. A sliding portion that gives sliding resistance to the ring, and a mark that indicates a rotation position when the adjustment ring is manually rotated, and a scale corresponding to the mark are provided on the adjustment ring. , It is made more concrete by adopting the configuration.

  According to the present invention in which the lens cap is formed integrally with the lens barrel of the projector, since the lens cap is mounted on the projector so as not to be separated from the projector, the lens cap is reliably prevented from being lost. The In addition, there is no room for the lens cap to be hung from the projector with a string, making it easy to handle the lens cap when installing the projector on the installation surface, and the lens cap becoming annoying and annoying Will not occur. Therefore, the user does not have the trouble of managing the lens cap removed from the lens tube, and the trouble of disturbing the lens cap when installing the projector on the installation surface is eliminated.

  In the case where a shielding portion or a resin hinge is provided in a non-use area of the light projection opening of the lens cylinder, there is an advantage that the lens cap can be made compact and the opening / closing operation can be facilitated by utilizing the optical characteristics of the projector.

  Further, in the case where a sliding resistance is applied to the adjustment ring for adjusting the focus or zoom provided in the lens tube, the adjustment of the focus or zoom by the adjustment ring is easily performed using the lens cap. Thus, there is an advantage that the usability for the user is improved.

  FIG. 1 shows a projector according to an embodiment of the present invention, in which (A) and (C) are side views of the main part, and (B) and (D) are front views of the main part. 3A and 3B are explanatory diagrams showing optical characteristics of a DLP projector (reflection type projector).

  FIG. 3A is a side view of the main part of the DLP projector. 1 is a housing, 2 is a lens cylinder, and a lens (not shown) is attached to the lens cylinder 2. In this DLP projector, due to the structural reason of the optical system housed in the housing 1, the light projection port 21 of the lens barrel 2 is connected to the upper effective light projection area Z1 and the lower side as shown in FIG. There are two upper and lower sections in the use area Z2. In other words, the lens attached to the lens tube 2 is divided into an upper section that is used for projection and a lower section that is not used for projection. Generally, the height of the non-use area Z2 is projected. The diameter of the mouth 21 is 1/3 to 1/2. As indicated by the arrow P, the optical axis irradiated from the light projection port 21 of the lens tube 2 is inclined upward by θ with respect to the horizontal axis.

  In the projector of this embodiment, by utilizing the fact that the light projection port 21 of the lens barrel 2 is divided into two parts, the upper effective light projecting area Z1 and the lower non-use area Z2, as described above. A lens cap 3 for opening and closing the light projection port 21 of the lens tube 2 is provided. That is, as shown in FIG. 1, a part or the whole of the unused area Z2 of the light projection port 21 of the lens tube 2 is covered with a shielding portion 22 integrally molded with resin together with the lens tube 2, and the shielding portion. The lens cap 3 is integrally formed with the resin hinge 4 formed over the entire length of the straight upper end edge of the resin 22, so that the lens cap 3 is connected to the shielding portion 22 via the resin hinge 4. . The lens cap 3 is provided with an arc-shaped fitting piece 31 that is fitted to and removed from the lens cylinder 2, and the resin hinge 4 is extended as shown in FIG. The effective light projection area Z1 of the light projection opening 21 is closed by fitting it outside. Also, as shown in FIG. 3B, the fitting piece 31 is removed from the lens tube 2 and the resin hinge 4 is bent, so that the effective light projecting area Z1 of the light projecting opening 21 is opened, and projection is performed from the effective light projecting area Z1. An image can be projected.

  According to the projector of this embodiment, since the lens cap 3 is integrally formed with resin together with the shielding portion 22 and the resin hinge 4 on the lens barrel 2 of the projector, there is no need to handle the lens cap 3 alone. Since the lens cap 3 is not separated from the projector, a situation in which the lens cap 3 is lost cannot occur. Further, when the projector is installed on the installation surface, it is impossible for the lens cap 3 to be sandwiched between the installation surface and the projector, so that the lens cap is not obstructed when the projector is installed.

  Furthermore, since the lens cap 3 only needs to have a size that can open and close only the upper section of the light projection port 21 of the lens tube 2, that is, the effective light projection region Z1, the lens cap 3 is large enough to open and close the light projection port 21 as a whole. There is an advantage that it is more compact than the above, and its opening and closing operation is easy.

  FIG. 2 shows a projector according to another embodiment of the present invention, in which (A) and (B) are side views of the main part, (C) is a front view of the main part, and (D) is a perspective view of the lens cap 3. FIG.

  As shown in FIG. 4D, the lens cap 3 is formed by connecting a mounting portion 35 and a cap main body portion 37 formed in an arc shape when viewed from the front by a straight resin hinge 39. Then, as shown in FIGS. 2A and 2B, the attachment portion 35 is fitted into the substantially lower half portion of the lens tube 2, and the substantially upper half portion of the lens tube 2 is opened and closed by the cap body portion 37. It is like that. Further, as can be inferred from FIG. 5C, the attachment portion 35 is manually rotated in which the sliding portion 36 formed by the inner peripheral surface thereof is arranged concentrically with the lens tube 2. When the adjustment ring 5 is in contact with the outer peripheral surface to be operated and the adjustment ring 5 is manually rotated, a sliding resistance is applied to the adjustment ring 5 by the sliding portion 36 of the mounting portion 35. Yes. Furthermore, an engagement groove portion 38 extending in the axial direction is provided at the circumferential central portion of the attachment portion 35, and a rib-like engagement protrusion 12 provided on the projector housing 1 is provided in the engagement groove portion 38 in the left-right direction. And the fitting part 35 is pressed and fixed to the lens tube 2 by fitting with no rattling in the vertical direction. Here, the engaging groove portion 38 and the engaging protrusion 12 engaged therewith form a fixing means for attaching the lens cap 3 to the lens tube 2 at a fixed position.

  The adjustment ring 5 is provided to adjust the focus or zoom, and is manually rotated when the projector is installed on the installation surface and an image is displayed on the screen. The adjustment ring 5 is provided with a scale 51, whereas the upper edge 35a of the mounting portion 35 is formed as a mark 6 for scale alignment.

  This projector is the DLP projector described above. Due to its optical characteristics, the projection port 21 of the lens tube 2 is divided into an upper effective projection area Z1 and a lower unused area Z2 as described in FIG. It is divided into two sections up and down. The mounting portion 35 covers a part or all of the non-use area Z2.

  According to the projector of this embodiment, although the lens cap 3 is separate from the projector, the lens cap 3 is handled integrally with the projector by attaching the mounting portion 35 of the lens cap 3 to the lens tube 2. Therefore, there is no possibility that the lens cap 3 will be lost or the lens cap 3 will be disturbed when the projector is installed. In particular, according to this embodiment, since the sliding portion 36 of the mounting portion 35 of the lens cap 3 is configured to give a sliding resistance to the adjustment ring 5, the user manually rotates the adjustment ring 5. When adjusting the focus or zoom, the adjustment ring 5 stops exactly at the desired rotation position by the user, and after the stop, the positional deviation in the rotation direction does not occur, and it becomes easy to adjust the focus or zoom. In addition, the rotation of the adjustment ring 5 can be adjusted using the mark 6 of the mounting portion 35 and the scale 51 of the adjustment ring 5 as a guideline, so that the focus or zoom can be appropriately adjusted without actually displaying the image on the screen. There is an advantage that it becomes possible to adjust.

  Since the projector described in FIG. 2 is a DLP projector, the unused area Z2 (see FIG. 3B) of the light projection port 21 of the lens barrel 2 is covered with the mounting portion 35. In the case of an LCD projector (liquid crystal display projector: transmissive projector), since the entire projection port 21 is used for light projection, the front surface of the mounting portion is opened and a resin is provided at the lower end of the mounting portion. A circular cap body portion may be provided continuously through a hinge.

(A) is the side view of the principal part in the state which opened the lens cap in the projector which concerns on embodiment of this invention, (B) is a front view of (A), (C) is the state of closing the lens cap. The side view of a principal part and (D) are front views of (C). (A) is the side view of the principal part in the state which opened the lens cap in the projector which concerns on other embodiment, (B) is the side view of the principal part in the state which closed the lens cap, (C) is the principal part. (D) is a schematic perspective view of a lens cap. (A) is explanatory drawing which showed the optical characteristic of the DLP projector (reflection type projector), (B) is a front view for demonstrating the optical characteristic.

Explanation of symbols

2 Lens tube 3 Lens cap 4 Resin hinge 5 Adjustment ring 6 Mark 12 Engagement protrusion (fixing means)
21 Emitting Port 22 Shielding Section 35 Mounting Section 36 Sliding Section 37 Cap Body 38 Engaging Groove (Fixing Means)
39 Resin hinge 51 Scale Z1 Effective projection area Z2 Non-use area

Claims (7)

In a projector equipped with a lens cap for opening and closing the light projection opening of the lens tube,
The projector is a reflection type projector in which the light projection port of the lens tube is divided into an upper effective light projecting region and a lower non-use region, and is at least one of the non-use regions of the lens tube. The lens cap that opens and closes the effective light projecting area or the effective light projecting area and the remaining part of the non-use area is connected to the upper end edge of the shielding part via a resin hinge. The projector is characterized in that the lens cap is integrally formed of resin together with the lens tube, the shielding portion, and the resin hinge. In a projector equipped with a lens cap for opening and closing the light projection opening of the lens tube,
The projector according to claim 1, wherein the lens cap is connected to the lens tube via a resin hinge. The projector according to claim 2, wherein the lens cap is integrally formed with the lens cylinder with resin. The light projection opening of the lens cylinder is divided into an upper effective light projection area and a lower non-use area in the vertical direction, and at least a part of the non-use area is integrally formed with the lens cylinder with resin. The lens cap that opens and closes the effective light projecting region or the effective light projecting region and the remaining portion of the non-use region via the resin hinge is connected to the upper end edge of the shielding unit. The projector according to claim 3. In a projector provided with a lens cap for opening and closing a light projection opening of a lens barrel provided with an adjustment ring for manually adjusting the focus or zoom.
A cap body that opens and closes the light projecting opening that is integrally provided to the mounting portion through a resin hinge; The mounting portion includes a sliding portion that provides sliding resistance to the adjustment ring, and a mark that indicates a rotation position when the adjustment ring is manually rotated. And a scale corresponding to the mark. In a projector provided with a lens cap for opening and closing a light projection opening of a lens barrel provided with an adjustment ring for manually adjusting the focus or zoom.
The lens cap includes a mounting portion for the lens tube, and a cap main body that opens and closes the light projecting port that is integrally connected to the mounting portion via a resin hinge, and the adjustment ring includes the adjustment ring. A projector having a sliding portion for providing sliding resistance to the projector. 7. An attachment portion fixing means for fixing the attachment portion to the lens tube is added, and the attachment portion is provided with a mark indicating a rotation position when the adjustment ring is manually rotated. The projector described in 1.

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