JPH10282547A - Camera provided with zooming function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure which is suitable for being used for a compact camera provided with the zooming function and for providing a built-in lens hood. SOLUTION: The camera provided with the zooming function is equipped with a cam ring 12 retracted in a camera body and a top end lens barrel member 16 which supports the front group lens L1 of a zoom lens and moves forward and backward to be retracted in the cam ring 12. This cam ring 12 has two-barrel structure having outer and inner cylindrical parts 12A and 12B and an annular space RS which is opened on the front side and closed on the rear side is formed between the outer and inner cylindrical parts 12A and 12B. The top end lens barrel member 16 has a cylindrical part 16b extended from a supporting part for the front group lens L1 to the rear side. A nearly cylindrical lens hood 10 is arranged in a state where it is fitted on the outer periphery of the cylindrical part 16b of the top end lens barrel member 16, to be movable in an optical axial direction. When the top end lens barrel member 16 moves forward and backward, the cylindrical part 16b of the member 16 and the lens hood 10 are retracted in the annular space RS of the cam ring 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a camera with a zoom function.

[0002]

2. Description of the Related Art Photo cameras are broadly classified into high-end models compatible with professional use and popular models compatible with family use. The latter is particularly compact because of the importance of portability (portability). Has rapidly progressed, and as a result, is now commonly referred to as a compact camera. Nowadays, it is not uncommon for compact cameras to have a zoom function. When taking a telephoto shot with a compact camera with zoom function, the lens barrel must be made to protrude greatly from the camera body to increase the focal length.However, when the camera is not in use, the lens barrel must be placed inside the camera body. I am pleased that it can be completely immersed and stored so that good portability can be obtained.

[0003]

However, there is hardly any compact camera having such a structure equipped with a lens hood. As is well known, the lens hood is used to prevent intense light from outside the angle of view from being incident on the lens at the time of backlight, etc., and being reflected in the lens barrel to generate flare, thereby preventing image quality from deteriorating. Needless to say, this is also useful for compact cameras. For example, in a zoom lens mounted on a single-lens reflex camera, a built-in lens hood that is provided on the lens and that is not detachably attached is used. That is, a cylindrical lens hood is fitted and provided on the outer periphery of the frontmost part of the lens barrel, and this lens hood is manually pulled out when used and protruded forward when used, and pushed backward when not used. I try not to get in the way. However, in the case of a compact camera in which the lens barrel is completely immersed in the camera body and can be housed, it is extremely difficult to adopt the same structure.
If a separate lens hood that is not a built-in type is connected to the front end of the lens using a bayonet type or screw type connection structure, the portability that can be said to be the life of a compact camera because the lens hood has to be carried around. Will be spoiled. The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a zoom lens-equipped compact camera or the like that allows a lens barrel to be completely immersed and stored in a camera body. It is an object of the present invention to provide a camera that has been difficult to equip with a built-in lens hood, so that the built-in lens hood can be suitably equipped.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a first lens barrel member which advances and retracts in the direction of an optical axis and which comes and goes in a camera body, and a lens unit which supports a frontmost lens group of a zoom lens. In a camera with a zoom function having a second lens barrel member which advances and retreats in the axial direction and which comes and goes in the first lens barrel member, an outer cylinder part and an inner cylinder part which connect the first lens barrel member to each other at a rear end thereof By defining a double-cylinder structure having the following structure, an annular space is opened between the outer tube portion and the inner tube portion and the front is open and the back is closed, and the second lens barrel member is moved to the frontmost position. A lens support portion that supports the lens group of the lens portion, and a cylindrical portion having a front end connected to the lens support portion and extending rearward, and is formed substantially on the outer periphery of the cylindrical portion of the second barrel member. Equipped with a cylindrical lens hood fitted to be movable in the optical axis direction,
When the second barrel member advances and retreats in the optical axis direction, the cylindrical portion of the second barrel member and the lens hood protrude and retract into the annular space of the first barrel member. I do. Further, the present invention is configured such that when the lens hood is retracted to the rearmost position on the second lens barrel member, and when the second lens barrel member is retracted to the rearmost position relative to the first lens barrel member, The cylindrical portion of the second barrel member and the lens hood are substantially completely accommodated in the annular space of the first barrel member. Further, the present invention is characterized in that when the first barrel member is retracted to the rearmost position with respect to the camera body, the first barrel member is substantially completely accommodated in the camera body. And Also, in the present invention, the outer peripheral surface and the inner peripheral surface of the rear end of the second lens barrel member are extremely different from the outer peripheral surface of the inner cylindrical portion of the first lens barrel member and the inner peripheral surface of the outer cylindrical portion, respectively. They are opposed to each other with a small gap, thereby obtaining a light shielding property. Further, the invention is characterized in that the first barrel member is configured as a cam ring of a zoom mechanism. Further, the invention is characterized in that the camera is a compact camera provided with a lens shutter. Further, the invention is characterized in that the lens hood is slidably fitted to the second lens barrel member with a predetermined frictional resistance. Further, the present invention is a camera with a zoom function, wherein a tip barrel member that supports a frontmost lens group of a zoom lens and is provided so as to be able to protrude and retract from a camera body, and is provided on the tip barrel member in an optical axis direction. A lens hood fitted movably and housed in the camera body together with the tip barrel member.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a non-use state of a camera with a zoom function according to the present invention (a state in which a lens barrel is stored).
FIG. 2 is an upper half sectional view showing a state where the lens of the camera is at the wide end position, and FIG. 3 is an upper half sectional view showing a state where the lens of the camera is at the tele end position. Figure,
FIG. 4 is an exploded perspective view of the camera, and FIG. 5 is a perspective view of the camera. As shown in FIG. 5, the camera 1 has a lens barrel 2.
Is a compact camera provided with a lens shutter and capable of being completely immersed in the camera body 3. A slide barrier 4 is attached to the front surface of the camera body 3 so as to be slidable in the left-right direction, and a release button 5, a wide switch button 6,
A teleswitch button 7 is provided. When the camera is not used, the lens can be protected by covering the vicinity of the lens on the front surface of the camera body 3 with the slide barrier 4. At this time, the lens barrel 2 is completely immersed in the camera body 3. . When using the camera, if the slide barrier 4 is slid to the side, a switch (not shown) is closed to drive a zoom motor, which will be described later, and the lens barrel 2 projects to the wide end state. The state is shown. The lens barrel 2 is, as shown in FIGS.
The zoom lens includes a first lens barrel member 12, a second lens barrel member 16, and the like. In the drawing, L1 denotes a front lens group of the zoom lens, L2 denotes a rear lens group, and 10 denotes a lens hood. The first lens barrel member 12 advances and retreats in the optical axis direction of the lens so as to protrude and retract from the camera body 3, and the second lens barrel member 16 includes a front lens group, which is the frontmost lens group of the zoom lens. L1 is supported so as to advance and retreat in the optical axis direction and to protrude and retract from the first lens barrel member 12. In the embodiment, since the first lens barrel member 12 is configured as a cam ring (drive ring) of the zoom mechanism, in the following description, the first lens barrel member 12 will be referred to as a cam ring, and the second lens barrel member will be described. Since 16 defines the distal end portion of the lens barrel, the second barrel member 16 is referred to as a distal barrel member.

The zoom mechanism of the camera includes a moving mechanism for moving the cam ring 12 and the tip barrel member 16 in the optical axis direction. First, the moving mechanism will be described. 1 to 4, a fixed ring 11 fixed to the camera body 3 is a substantially cylindrical member.
A female helicoid 11a and a pair of rectilinear guide grooves 11b extending in the axial direction (optical axis direction) of the cylindrical shape are formed. The cam ring 12 is a substantially cylindrical member fitted into the fixed ring 11, and a male helicoid 12 a is formed on an outer surface of a rear end of the cam ring 12. The male helicoid 12 a is screwed with the female helicoid 11 a of the fixed ring 11. doing. The cam ring 12 is further provided with a spiral gear portion 12b formed by cutting off a part of the male helicoid 12a. The gear portion 12b is provided with a zoom drive gear 13 rotatably supported by the stationary ring 11. Are engaged. The zoom drive gear 13 is rotated by a zoom motor (not shown). When the zoom drive gear 13 drives the cam ring 12 to rotate, the cam ring 12 is driven by the male helicoid 12a and the female helicoid 1a.
While being guided by 1a and rotating, it moves forward or backward in the optical axis direction according to the direction of rotation.

The cam ring 12 is formed in a double cylinder structure having an outer cylinder 12A and an inner cylinder 12B. The outer cylindrical portion 12A and the inner cylindrical portion 12B are formed at the rear ends thereof with an annular light shielding wall 1.
2C, the outer cylinder portions 12A
An annular space RS having a front opening and a rear closure is defined between the inner space 12B and the inner cylinder 12B. On the inner surface of the inner cylinder portion 12B, a set of three spiral cam grooves (first cam grooves) 12d for moving the front group lens L1 forward and backward, and another three cam grooves for moving the rear group lens L2 forward and backward. A set of spiral cam grooves (second
Cam groove) 12e.

A substantially cylindrical linear guide ring 14 is fitted into the cam ring 12, and the rear end of the linear guide ring 14 is fixed to the front surface of the linear guide plate 15 via a small screw. . These straight guide rings 14 and straight guide plates 15 are integrated to form straight guide members 14 and 15. A pair of radial projections 15a formed on the straight guide plate 15
Are engaged with the pair of rectilinear guide grooves 11b on the inner surface of the fixed ring 11, so that the rectilinear guide members 14 and 15 can move in the optical axis direction, and cannot rotate around the optical axis. ing. The straight guide ring 14 is formed with six straight guide grooves 14a extending in the optical axis direction.
The role of 4a will be described later. A small diameter portion is formed on the outer periphery of the rear end of the straight guide ring 14, and a circumferential groove is defined by the small diameter portion and the front surface of the straight guide plate 5. An inner flange 12f formed at the rear end of the cam ring 12 is loosely fitted in this circumferential groove, whereby the cam ring 12 and the linear guide members 14 and 15 can rotate relative to each other. It is designed to move together.
Therefore, when the cam ring 12 advances and retreats in the optical axis direction while being rotated by being driven by the zoom drive gear 13, the rectilinear guide members 14 and 15 also advance and retreat in the optical axis direction together with the cam ring 12. The members 14 and 15 do not rotate, and therefore the straight guide grooves 14a of the straight guide ring 14
, The angular position around the optical axis is always kept constant.

The tip lens barrel member 16 is a member for supporting the front lens group L1, and has an annular wall portion 16a at the end perpendicular to the optical axis and a cylinder extending rearward from the outer peripheral edge of the annular wall portion 16a. Portion 16b, three flat plate arms 16c extending rearward from the inner peripheral edge of the annular wall portion 16a in parallel to the optical axis, and an optical axis connected near the rear end of the flat plate arm 16c. And a vertical ring-shaped plate portion 16d. The three flat arm portions 16c are fitted in every other three straight guide grooves of the six straight guide grooves 14a of the straight guide members 14, 15, and each of the flat arm portions 16c has a flat plate shape. The cam follower pin 16e provided at the rear end of the arm 16c is
B engages with the spiral first cam groove 12d formed on the inner surface of B. Therefore, when the cam ring 12 rotates, the front lens barrel member 16 moves to the supporting front lens group L1.
At the same time, depending on the rotation direction of the cam ring 12, the cam ring 12 is guided by the rectilinear guide groove 14a and moves forward or backward in the optical axis direction.

The front lens group L1 is a substantially annular unit housing 18a, and a combined lens mounted on the inner periphery of the unit housing 18a so as to be movable in the optical axis direction relative to the unit housing 18a. 1
8b. The unit housing 18a further includes:
A lens shutter mechanism 18c and a focusing mechanism (not shown) for moving the combination lens 18a back and forth with respect to the unit housing 18 according to the subject distance under the control of the focusing control mechanism are provided. The front lens group L1 is supported by the distal barrel 16 by being fixed to the ring-shaped plate portion 16d of the distal barrel 16 via small screws.
Therefore, of the distal barrel member 16, the annular wall portion 16 at the distal end is provided.
a, three plate-shaped arms 16c, and a ring-shaped plate 16
A lens supporting portion that supports the front lens group L1 is configured by d, and the cylindrical portion 16b has a front end connected to the lens supporting portion and extends rearward.

The rear lens group L2 includes an annular movable lens frame 1
7a and a combination lens 17b fixed to the inner peripheral portion of the movable lens frame 17a. On the outer periphery of the movable lens frame 17a, there are formed three plate-like arms 17c which once protrude radially outward and extend forward therefrom in parallel with the optical axis. The three flat arm portions 17c are the remaining three of the six straight guide grooves 14a of the straight guide members 14 and 15, to which the flat arm portions 16c of the tip barrel member 16 are not engaged. The above-mentioned spiral second cam groove formed on the inner surface of the inner cylindrical portion 12B of the cam ring 12 is provided with a cam follower pin 17d provided at the rear end of each flat arm portion 17c. 12e. Therefore, if the cam ring 12 rotates, the rear lens group L2 moves the straight guide groove 14 according to the rotation direction of the cam ring 12.
a to move forward or backward in the optical axis direction.

The lens hood 10 is a substantially cylindrical member having an inner flange 10a formed at a rear end thereof, and is fitted to the outer periphery of a front barrel member 16. The lens hood 10
It can be manually moved in the optical axis direction relative to the tip barrel member 16. The sliding surface of the inner flange 10a in contact with the distal lens barrel member 16 is subjected to flocking,
The lens hood 10 slides with a certain degree of frictional resistance with respect to the tip barrel member 16. Outer flanges 16f and 16g are formed on the outer periphery of the front barrel member 16 at its front end and rear end, respectively. These outer flanges 16
f and 16g function as stoppers, and the lens hood 10
The lens hood 10 is prevented from coming off from the distal lens barrel member 16 by abutting on the inner flange 10a of the camera. Therefore, the lens hood 10 is provided in this camera as a built-in lens hood. In order to fit the lens hood 10 to the outer periphery of the tip barrel member 16, the lens hood 10 is formed in advance into two members that are vertically divided into two members.
The members may be fitted together by joining them together, and the lens hood 10 is made of plastic having elasticity. You may make it get over the outer flange 16f. Further, one of the two outer flanges 16f and 16g is provided as a separate member from the main body of the distal barrel member 16, and after the lens hood 10 is fitted to the outer periphery of the distal barrel member 16, A separate member may be attached to the main body.

Outer flange 1 at rear end of tip barrel member 16
6g is the cam ring 12 in addition to the function as a stopper.
It also functions as a light blocking member for preventing harmful light from entering the camera from the gap between the lens barrel 16 and the tip barrel member 16. That is, by forming the outer flange 16g at an appropriate height, the outer peripheral surface and the inner peripheral surface of the rear end of the front barrel member 16 become the inner peripheral surface and the inner cylindrical portion of the outer cylindrical portion 12A of the cam ring 12, respectively. It faces the outer peripheral surface of 12B with an extremely small gap. Since a maze effect is obtained by this, the cam ring 12 and the tip barrel member 16
A sufficient light-shielding property can be ensured without using an annular light-shielding member made of paper, felt, cloth, or plastic, which is fixed to one of them and slidably contacts the other with considerable frictional force. According to this light shielding structure, the friction between the cam ring 12 and the front lens barrel member 16 is almost zero because no light shielding member that exerts a frictional force is used, and the capacity of the zoom motor and the battery can be small, so that the camera can be used. It can greatly contribute to the downsizing of.

Next, the operation of the camera with a zoom function according to the above-described embodiment will be described. When the camera is not used, the lens hood 10 is pushed in by hand and retracted to the rearmost position on the distal lens barrel member 16, and the slide barrier 4 is slid to the center of the camera body 3.
As shown in FIG. 1, the lens barrel 2 is immersed in the camera body 3 by the zoom motor in conjunction with this movement, and the lens barrel 2 is covered with the slide barrier 4. At this time, the zoom mechanism rotates the cam ring 12 to a limit position in one rotation direction,
The cam ring 12 is retracted to the rearmost position with respect to the camera body 3, and the tip barrel 16 is retracted to the rearmost position with respect to the cam ring 12. As is clear from FIG. 1, in this state when the lens barrel is housed, the cam ring 12 is almost completely housed in the camera body 3, and
Further, the tip barrel member 16 and the lens hood 10 are substantially completely accommodated in the above-described annular space RS formed between the outer cylinder portion 12A and the inner cylinder portion 12B of the cam ring 12. Further, when the camera is not used, the slide barrier 4 covers the vicinity of the lens on the front surface of the camera body 3 to protect the lens.

When the camera is used, when the slide barrier 4 is slid to the side of the camera body 3, the lens barrel 2 is protruded by the zoom motor and the wide end state shown in FIG. 5 is obtained. By pressing the wide switch button 6 or the tele switch button 7 from this state, the zoom lens
It can be moved to the wide end position (maximum wide-angle shooting position) shown in FIG. 2, the tele end position (maximum telephoto shooting position) shown in FIG. 3, or an arbitrary focal length between them. That is, when the wide switch button 6 or the tele switch button 7 is operated, a known zoom mechanism control device that electrically detects the operation controls the zoom motor to rotate the cam ring 12 in a necessary direction. Then, according to the rotation of the cam ring 12, the inner cylindrical portion 12 of the cam ring 12
B of the spiral first cam groove 12d formed on the inner surface of
The front group lens L1 and the rear group lens L are formed by the cam groove 12e.
2 moves, and the focal length of the zoom lens changes. When the focal length is changed in this way, the cam ring 12 advances and retreats in the optical axis direction relative to the camera body 3 with its own rotation, and the cam barrel 12 also moves with the tip barrel member 16.
Also advance and retreat relative to the cam ring 12 in the optical axis direction. Therefore, it has a two-stage telescopic lens barrel structure, and a large stroke of the distal lens barrel member 16 can be obtained, and a wide focal length range can be obtained. At the same time, when the camera is not used, the lens barrel 2 is moved into the camera body 3. Since the camera can be completely immersed in the camera, it has an advantageous structure for enhancing the compactness of the camera. When the tip barrel member 16 advances and retreats relative to the cam ring 12 in the optical axis direction, the cylindrical portion 16b of the tip barrel member 16 and the lens hood 10 protrude and retract into the annular space RS of the cam ring 12. Thus, it is possible to obtain the above advantages and to equip the camera with a built-in lens hood.

The lens hood 10 is, as shown in FIG.
If the front end of the tip barrel member 16 protrudes from the front end of the cam ring 12, it can be picked up with a finger and pulled out, and pulled out and used as needed. FIGS. 2 and 3 show a state in which the lens hood 10 is pulled out to the forefront on the front barrel member 16. In a state where the lens hood 10 is not manually pulled out, the inner flange 10a of the lens hood 10 is in contact with the outer flange 16g of the distal barrel member 16, so that the inner hood 10a is not in use or telephoto from the wide end. In the direction, the lens hood 10 and the front barrel member 16 advance integrally. When the lens hood 10 is retracted from the telephoto direction to the wide direction, the frictional force between the inner flange 10a of the lens hood 10 and the outer peripheral surface of the distal lens barrel member 16 causes the lens hood 10 and the distal lens barrel member 1 to move.
6 moves back together. Therefore, the lens hood 10
Keeps contact with the outer flange 16g and advances and retreats integrally with the distal lens barrel member 16, so that the lens hood 10 does not become an obstacle even when the lens hood is not used. For telephoto shooting, the longer the lens hood 10, the better the performance. However, when a long lens hood is provided, it is necessary to adjust the amount of the lens hood pulled out so that vignetting does not occur during wide-angle shooting. There is no worry about vignetting when using a short lens hood. After use, just push the lens hood with your finger or palm for 10 minutes.
Can be easily stored.

Therefore, according to the above-described embodiment, the outer cylindrical portion 12A of the cam ring (first lens barrel member) 12 having a double cylindrical structure.
The cylindrical portion 16b of the tip barrel member (second barrel member) 16 and the lens hood 10 fitted on the outer periphery of the cylindrical portion 16b protrude into and retract from the annular space RS defined between the inner cylindrical portion 12B and the inner cylindrical portion 12B. Thus, it has been difficult to equip a built-in lens hood so far, such as a compact camera with a zoom function in which the lens barrel 2 can be completely immersed and stored in the camera body 3. Camera can be suitably equipped with a built-in lens hood. Therefore,
Since there is no need to carry a separate lens hood, the image quality improving effect of the lens hood can be enjoyed without impairing the portability of the camera. Further, in the structure of this embodiment, the cam ring 12 and the tip barrel member 1
6 is obtained without using a conventional annular light-shielding member which necessarily involves friction between them, so that the capacity of the zoom motor and the battery can be reduced, and the camera can be made more compact. Enable.

With respect to the light blocking effect of the lens barrel, a camera having a lens shutter is required to have a higher degree of light blocking performance than a camera having a focal plane shutter. Since a sufficient light-shielding property is achieved even for a camera having a shutter, it is particularly suitable for such a compact camera. However,
The present invention can be suitably used for other types of cameras, and the scope of application is not necessarily limited to compact cameras. In the embodiment described above,
Although the first barrel member is a cam ring, the first barrel member does not necessarily have to be a cam ring. The first lens barrel member defines an annular space that defines an annular space in which the front portion is open and the rear portion is closed when the cylindrical portion of the tip barrel member and the lens hood advance and retreat in the optical axis direction. What is necessary is just a member.

[0019]

As is apparent from the above description, the present invention supports the first lens barrel member which advances and retracts in the optical axis direction and which comes and goes in the camera body, and the frontmost lens group of the zoom lens, and A camera with a zoom function having a second lens barrel member that advances and retracts into and out of the first lens barrel member.
By forming the lens barrel member in a double cylinder structure having an outer cylinder portion and an inner cylinder portion connected to each other at a rear end, a front portion is opened between the outer tube portion and the inner cylinder portion and a rear portion is closed. A lens support portion for supporting the frontmost lens group, and a cylindrical portion having a front end connected to the lens support portion and extending rearward. Formed into
A substantially cylindrical lens hood is fitted on the outer periphery of the cylindrical portion of the second barrel member so as to be movable in the optical axis direction, and when the second barrel member advances and retreats in the optical axis direction, The cylindrical portion of the second barrel member and the lens hood are configured to protrude and retract into the annular space of the first barrel member. Further, the present invention is a camera with a zoom function, wherein a tip barrel member that supports a frontmost lens group of a zoom lens and is provided so as to be able to protrude and retract from a camera body, and is provided on the tip barrel member in an optical axis direction. A lens hood fitted movably and housed in the camera body together with the distal end barrel member. For this reason, cameras that had previously been difficult to equip with a built-in lens hood, such as a compact camera with a zoom function that allows the lens barrel to be completely A lens hood can be suitably equipped. Therefore, since there is no need to carry a separate lens hood, the effect of improving the image quality by the lens hood can be enjoyed without impairing the portability of the camera.

[Brief description of the drawings]

FIG. 1 is an upper half sectional view showing a non-use state (a state in which a lens barrel is stored) of a camera with a zoom function according to the present invention.

FIG. 2 is an upper half sectional view showing a state where a lens of the camera is at a wide end position.

FIG. 3 is an upper half sectional view showing a state where a lens of the camera is at a tele end position.

FIG. 4 is an exploded perspective view of the camera.

FIG. 5 is a perspective view of a camera.

[Explanation of symbols]

 L1 Front lens group L2 Rear lens group RS Annular space 2 Lens barrel 3 Camera body 10 Lens hood 12 Cam ring (First lens barrel member) 16 Tip lens barrel member (Second lens barrel member)

Claims (8)

[Claims] A first lens barrel member which moves forward and backward in the optical axis direction and moves into and out of the camera body; and a first lens group which supports a frontmost lens group of a zoom lens and advances and retracts in the optical axis direction to move into and out of the first lens barrel member. A camera with a zoom function having a second barrel member, wherein the first barrel member is formed in a double barrel structure having an outer barrel portion and an inner barrel portion connected to each other at a rear end. A front opening is defined between the outer cylinder portion and the inner cylinder portion to define an annular space in which a front portion is opened and a rear portion is closed. The second lens barrel member includes a lens support portion that supports the frontmost lens group, and a front end. A cylindrical portion that is connected to the lens support portion and extends rearward, and a substantially cylindrical lens hood is movably fitted in the optical axis direction on the outer periphery of the cylindrical portion of the second barrel member. When the second barrel member advances and retreats in the optical axis direction, a circle of the second barrel member is provided. Parts and the lens hood is to be infested with the annular space of the first barrel member, wherein the cameras with zoom function that. 2. When the lens hood is retracted to the rearmost position on the second lens barrel member, and when the second lens barrel member is retracted to the rearmost position relative to the first lens barrel member, 2. The camera with a zoom function according to claim 1, wherein the cylindrical portion of the second barrel member and the lens hood are substantially completely accommodated in the annular space of the first barrel member. 3. The camera according to claim 2, wherein the first lens barrel member is substantially completely accommodated in the camera body when the first lens barrel member is retracted to the rearmost position with respect to the camera body. Camera with zoom function. 4. An outer peripheral surface and an inner peripheral surface of a rear end of the second barrel member are extremely small with respect to an outer peripheral surface of an inner cylinder portion and an inner peripheral surface of an outer cylinder portion of the first barrel member, respectively. The camera with a zoom function according to any one of claims 1 to 3, wherein the cameras are opposed to each other with a gap, thereby obtaining a light shielding property. 5. The camera with a zoom function according to claim 1, wherein the first lens barrel member is configured as a cam ring of a zoom mechanism. 6. The camera with a zoom function according to claim 1, wherein the camera is a compact camera having a lens shutter. 7. The camera with a zoom function according to claim 1, wherein the lens hood is slidably fitted to the second lens barrel member with a predetermined frictional resistance. 8. A camera with a zoom function, comprising: a tip barrel member which supports a frontmost lens group of a zoom lens and is provided so as to be able to move in and out of a camera body; And a lens hood fitted in the camera body together with the tip barrel member so as to be capable of being fitted.