JPH06308575A - Sliding member of camera - Google Patents

Abstract

PURPOSE:To well maintain the lubricity of a sliding part even if a lubricant is not used and to obtain smooth sliding operations over a long period of time by coating at least the sliding point of a sliding member with a composite plating film formed by eutectoid dispersion of low-friction coefft. particles, such as graphite fluoride or fluororesin particles in a metallic matrix. CONSTITUTION:This sliding member is constituted by coating the sliding part surface of a base body 1 with the composite plating film 4 formed by eutectoid dispersion of the low-friction coefft. particles 3 in the metallic matrix 2. A part of the low-friction coefft. particles 3a are exposed on the surface of the composite plating film 4 and the good lubricity is imparted by the exposed low-friction coefft. particles 3a. The lubricating agent is thus not required. The eutectoid particles in the film 4 are freshly exposed on the surface of the film 4 even if the surface of the composite plating film 4 is worn. The always good lubricity is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to gears, cams, levers, shafts, springs used in mechanical mechanism parts such as a shutter mechanism part and a focus mechanism part of a camera.
The sliding members that make up various mechanical parts of the camera, such as the pressure plate, will be described in more detail. Noise generation during sliding can be reduced as much as possible, and the lubrication is excellent and the driving torque can be small. The present invention relates to a sliding member of a camera.

[0002]

2. Description of the Related Art Conventionally, sliding members such as gears and cams used in various mechanism parts of a camera such as a shutter mechanism part and a focus mechanism part are usually formed of a metal material, but they are inferior in lubricity as they are. Since smooth sliding operation cannot be obtained and noise is generated, molybdenum disulfide, grease, etc. are applied as a lubricant for use.

[0003]

However, molybdenum disulfide is inferior in durability and cannot maintain lubricity for a long period of time. Further, grease has a problem that it solidifies at a low temperature, while it elutes at a high temperature.

Here, in a recent camera in which the focus mechanism section and the shutter mechanism section are automated and computerized, if the lubricity of the sliding members of these mechanisms deteriorates, not only noise but also a large driving torque is generated. It becomes necessary to drive the motor smoothly with a small motor, and the battery consumption increases.

The present invention has been made in view of the above circumstances, has a good lubricity without using a lubricant, and can obtain a smooth sliding operation for a long period of time without being affected by the temperature environment. It is an object of the present invention to provide a sliding member for a camera, which is capable of preventing noise during sliding as much as possible.

[0006]

Means for Solving the Problems and Actions The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, at least the sliding member of the sliding member constituting the mechanical portion such as the focus portion and shutter portion of the camera is slid. By coating the parts with a composite plating film in which low friction coefficient particles such as fluorinated graphite and fluororesin particles are co-eutectically dispersed in a metal matrix, the lubricity of sliding parts is improved without using a lubricant. Therefore, smooth sliding operation can be obtained for a long period of time without being affected by the temperature environment, reliable sliding operation can be obtained with a small driving torque, and noise during sliding is generated. The inventors have completed the present invention by finding that it can be prevented as much as possible.

Therefore, according to the present invention, in a sliding member which constitutes various mechanical parts of a camera, a composite in which low friction coefficient particles are co-deposited and dispersed in a metal matrix at least a portion of the sliding member which comes into contact with and slides with another member. A sliding member for a camera, which is characterized by being coated with a plating film.

[0008]

EXAMPLES The present invention will be specifically described with reference to the following examples. FIG. 1 shows a sliding member of a camera according to an embodiment of the present invention, which includes an interlocking lever 6, operating pins 7 and 8, cam grooves 9 and 11, which constitute the shutter mechanism portion shown in FIG.
The sliding members 12 and 14, the base plate 15, the spring 16 and the helicoid 17, the actuating pin 18, the cam frame 22, the guide rod 23, etc., which constitute the focus mechanism portion shown in FIG. In FIG. 2, 5 is a driving device, 10 and 13 are diaphragm blades, and 19 in FIG.
Is a shutter block, 20 and 21 are zooming grooves, 2
4 is a rear group frame, 25 is a rear fixed frame, L1 is a front group lens, L2
Is a rear lens group.

As shown in FIG. 1, this sliding member is obtained by coating the surface of the sliding portion of the substrate 1 with a composite plating film 4 in which particles 3 having a low coefficient of friction are eutectically dispersed in a metal matrix 2. The part 3 a of the low friction coefficient particles 3 is exposed on the surface of the composite plating film 4.

Here, the base 1 may be made of a usual material depending on the type of the sliding member, and is not particularly limited, but usually stainless steel, brass, copper alloy, iron or the like. Metallic materials are used.

The metal matrix 2 of the composite plating 4
As, nickel, nickel-phosphorus alloy, nickel-
Nickel such as a boron alloy or its alloy is preferably used, but not limited to these, and any one can be adopted as long as it can eutectoidly disperse the low friction coefficient particles 3.

Next, as the low friction coefficient particles 3 which are eutectically dispersed in the matrix 2, fluorine compounds such as fluorinated graphite and fluororesin particles, and other organic polymer compound particles having a small friction coefficient are used. .

In this case, specific examples of the fluororesin particles include polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP). ), Tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer (EPE), tetrafluoroethylene-ethylene copolymer (ETFE), and the like, but especially polytetrafluoroethylene having a molecular weight of 10,000 or less. Oligomer particles are preferably used.

That is, the polytetrafluoroethylene oligomer particles having a molecular weight of 10,000 or less have more chain ends than ordinary polytetrafluoroethylene having a molecular weight of 100,000 or more, and the CF ₃ groups present at these terminals are large. A film having a high proportion of fluorine atoms on the surface can be formed, and higher lubricity can be obtained.

Examples of the other organic polymer compound particles include polyethylene, polypropylene, nylon and polyolefin.

The average particle size of the low friction coefficient particles 3 is 0.0
The thickness can be set to 5 to 30 μm, particularly 0.1 to 5 μm, but it is preferable to use as fine particles as possible. The amount of the low-friction coefficient particles in the matrix 2 is not particularly limited, but may be 2 to 50% by volume,
It is particularly preferably 5 to 30% by volume, and the film thickness of the composite plating film 4 is appropriately set according to the type of member and the like, but is usually 1 to 30 μm, and particularly 5 to 10 μm.

Such a composite plating film 4 can be obtained by a known composite plating method. In this case, the composite plating may be an electroplating method or an electroless plating method. Further, as the plating bath, it is possible to use a bath in which the low friction coefficient particles are dispersed in a plating solution having a known composition according to the use and material of the sliding member. The amount of dispersion is usually about 0.5 to 100 g / L, and particularly preferably 1 to 50 g / L. Furthermore,
A surfactant can be added to the plating solution in which the particles are dispersed as described above, for the purpose of making the dispersion of the particles uniform and increasing the amount of eutectoid on the plating film.

The plating conditions can be the usual conditions for the plating solution used, but the particles with a low coefficient of friction are dispersed in the plating solution as uniformly and as non-aggregated as possible, and the particles of the particles on the plating film are dispersed. It is preferable to perform sufficient stirring in order to increase the amount of eutectoid and to uniformly disperse and complex single particles in the plating film.

The composite plating film 4 thus obtained, particularly the composite plating film 4 in which the matrix 2 is a nickel alloy, can be heat-treated according to a conventional method to improve the film hardness. Further, the surface of the composite plating film 4 can be subjected to polishing treatment and coloring treatment.

The sliding member of the camera of the present invention is such that the surface of the sliding portion is coated with the composite plating film 4 in which the fluorine compound particles 3 are eutectically dispersed in the metal matrix 2 as described above. As shown in FIG. 1, some low friction coefficient particles 3a are exposed on the surface of the composite plating film 4, and the exposed particles 3a provide good lubricity and do not require a lubricant. Further, even if the surface of the composite plating film 4 is worn due to long-term use, particles eutectoid inside the coating film 4 are newly exposed on the surface of the coating film 4, and good lubricity is always maintained.

Therefore, according to the sliding member of the present invention, the lubricity of the sliding portion is maintained well without using a lubricant, and the sliding member is smooth for a long period of time without being affected by the temperature environment. A sliding operation can be obtained, and a reliable sliding operation can be obtained with a small driving torque. Particularly, regarding the initial drive torque, a smaller torque is required as compared with the case where a lubricant is used. Therefore, in a recent camera in which the shutter mechanism section and the focus mechanism section are electronic and automated, it is possible to reduce the size of the driving motor and reduce the consumption of the battery.

Since good lubricity is always maintained in this way, noise and vibration during sliding can be prevented as much as possible. In this case, both high-pitched noise generated during high-speed sliding and low-pitched so-called chatter noise generated during low-speed sliding are significantly reduced.

As described above, the sliding member of the camera of the present invention is preferably used as a mechanical mechanism component such as a shutter mechanism section and a focus mechanism section, but its use is not limited to this. Instead, it is preferably used as a sliding member that constitutes various mechanical parts of the camera.

[0024]

As described above, according to the sliding member of the camera of the present invention, the lubricity of the sliding portion is kept good even if a lubricant is not used, and it is affected by the temperature environment. Without this, smooth sliding operation can be obtained over a long period of time, reliable sliding operation can be obtained with a small driving torque, and noise and vibration during sliding can be prevented as long as possible. be able to.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a shutter mechanism section of the camera.

FIG. 3 is an exploded perspective view showing a focus mechanism section of the camera.

[Explanation of symbols]

 1 Base 2 Metal Matrix 3,3a Fluorine Compound Particles 4 Composite Plating Film

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Satoshi Chiba, 1-5-1, Exit, Hirakata, Osaka Prefecture, Central Research Institute, Uemura Industrial Co., Ltd. (72): Yuji Shigekuni, 1-5, Exit, Hirakata, Osaka No. 1 Uemura Industrial Co., Ltd. Central Research Laboratory

Claims (1)

[Claims] 1. A sliding member which constitutes various mechanical parts of a camera, at least a portion of the member that comes into contact with and slides with another member is covered with a composite plating film in which particles with a low friction coefficient are eutectically dispersed in a metal matrix. A sliding member for a camera characterized by the above.