JP2014128742A - Electric shaver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric shaver capable of restraining a photocatalyst film from coming off.SOLUTION: An electric shaver of the present invention includes a cut body 11 that is driven by being subjected to a driving force from a power source 4. The cut body 11 includes a blade that forms a small blade 31 by etching a plate material, in which curved blade blanks 28 and 29 are formed by applying plastic working to the plate material with the formed small blade 31, and in which a photocatalyst film 75 is formed on a surface of each of the blade blanks 28 and 29.

Description

  The present invention relates to an electric razor including a cutting body that is driven by receiving a driving force from a power source. In the electric shaver of the present invention, a photocatalytic film is formed on the inner surface of the small blade constituting the cut body.

  As in the present invention, it is known in Patent Documents 1 to 3 that a photocatalyst film is provided on the inner surface of a small blade constituting a cutting body. For example, in Patent Document 1, an ultraviolet irradiation lamp is provided inside a fuzz chamber. In an electric shaver provided with a photocatalytic film on at least one of the surface of the outer blade, the surface of the inner blade, and the inner peripheral surface of the fluff chamber, The inside of the waste chamber can be maintained in a hygienic state.

JP 2004-105327 A (Claim 7) JP-A-11-216276 (paragraph numbers 0038-0042) JP 2000-94564 A (paragraph numbers 0044-0046)

  In this type of electric shaver, it is important to suppress the dropping of the photocatalytic film.

  An object of the present invention is to provide an electric razor that can prevent the photocatalytic film from falling off.

  The present invention is an electric shaver including a cutting body 11 that is driven by receiving a driving force from a power source 4. The cutting body 11 forms a small blade 31 by etching the plate material, and plastically processes the plate material on which the small blade 31 is formed to form curved blade blanks 28 and 29. This blade blank It includes a blade having a photocatalytic film 75 formed on the surfaces of 28 and 29.

  Further, the cutting body 11 forms a small blade 31 by etching the plate material, and plastically processes the plate material on which the small blade 31 is formed to form curved blade blanks 28 and 29. The blade blanks 28 and 29 are further etched. It includes a blade in which a photocatalytic film 75 is formed on the surface of the blade blanks 28 and 29 subjected to the etching treatment.

  An electric razor including a cutting body 11 that is driven by receiving a driving force from the power source 4 is an object. The cutting body 11 has a plate 28 having a blade hole 33 and a small blade 31 and a holding body 19 that holds the plate 28. The small blade 31 is formed with an outer surface 50 and an inner surface 51 that faces the outer surface 50 across the side surface 49. A photocatalytic film 75 is formed on at least the surface of the inner surface 51.

  In addition to the inner surface 51, a form in which a photocatalytic film 75 is formed on the surface of the side surface 49 can be adopted.

  A cutting edge 54 is provided at the protruding end of the outer surface 50 of the small blade 31, and the thickness dimension of the photocatalytic film 75 formed on the surface of the side surface 49 of the small blade 31 continuing to the cutting edge 54 gradually increases as the distance from the cutting edge 54 increases. It can be thicker.

  The photocatalyst film | membrane 75 formed in the surface of the side surface 49 can take the form currently formed in the inner dent R shape.

  The side surface 49 is formed in an inner dent R shape, and the surface curvature R2 of the photocatalyst film 75 formed on the side surface 49 can be set smaller than the surface curvature R1 of the side surface 49.

  A recess 81 is formed on the inner surface 51 of the small blade 31, and a photocatalytic film 75 is formed on the inner surface 51 so as to bite into the recess 81.

  A micro unevenness 82 is formed on the surface of the inner surface 51 of the small blade 31, and a form in which a photocatalytic film 75 is formed so as to cover the micro unevenness 82 can be adopted. The minute irregularities 82 are irregularities on the order of μm, and are formed by chemical treatment (etching treatment) with an acidic solution.

  The cutting body 11 is a reciprocating blade composed of a slit blade obtained by bending a plate 28 having a blade hole 33 and a small blade 31 into an inverted U shape, and the plate 28 constituting the cutting body 11 is bent into an inverted U shape. The curved wall 120 and a pair of mounting walls 121 provided continuously to the curved wall 120 and attached to the holding body 19, and the photocatalytic film 75 formed on the inner surfaces of the curved wall 120 and the mounting wall 121. The thickness dimension can be gradually increased from the curved wall 120 to the mounting wall 121.

  The photocatalytic film 75 is preferably composed of a hydrophilic catalyst.

  Since the small blade 31 is formed by etching the plate material, the photocatalyst film 75 is formed on the curved blade blanks 28 and 29 by plastic processing the plate material on which the small blade 31 is formed. Dropping of the photocatalytic film can be suppressed. Therefore, according to the electric shaver according to the present invention, good organic matter decomposing action and antibacterial action derived from the photocatalytic film 75 are exhibited, and it becomes possible to keep it hygienic for a long time.

  Further, since the photocatalyst film 75 is formed on the surfaces of the blade blanks 28 and 29 subjected to the etching process twice, it is possible to further prevent the photocatalyst film from falling off.

  Since the photocatalyst film 75 is formed on the inner surface 51 of the small blade 31, the portion of the inner blade 11 that is difficult to clean can be covered with the photocatalyst film 75. According to this, since the inside of the head part 2 of the electric razor can be efficiently sterilized and cleaned by utilizing the organic substance decomposition action and antibacterial action of the photocatalyst film 75, Also, when the scum is attached, it does not rot, and an electric razor excellent in antibacterial ability and deodorizing ability can be obtained. That is, according to the electric shaver according to the present invention, a good organic substance decomposing action and antibacterial action derived from the photocatalytic film 75 are efficiently exhibited, and therefore the inside of the head part 2 can be kept hygienic for a long time. It becomes possible.

  Further, when the photocatalytic film 75 is formed on the surface of the side surface 49 of the small blade 31 in addition to the inner surface 51 of the small blade 31, the organic matter derived from the photocatalytic film 75 not only on the inner surface 51 but also on the side surface 49. Degradation action and antibacterial action can be given.

  When the thickness of the photocatalyst film 75 formed on the surface of the side surface 49 of the small blade 31 continuous with the blade edge 54 gradually increases as the distance from the blade edge 54 increases, the photocatalyst film 75 having a large film thickness dimension is formed on the blade edge 54. By being attached, it is possible to prevent the cutting ability of the blade 31 from being greatly reduced. Therefore, it is possible to obtain an electric razor having a good organic matter decomposition action and antibacterial action of the photocatalytic film 75 without impairing the cutting ability (sharpness).

  When the photocatalyst film 75 formed on the surface of the side surface 49 is formed in an inner dent R shape, the surface area of the photocatalyst film 75 is increased compared to the case where the surface shape of the photocatalyst film 75 is flattened, and hairs Opportunities for contact between the waste and the photocatalytic film 75 can be increased. Therefore, the inside of the head part 2 can be sterilized and cleaned more efficiently.

  When the side surface 49 is formed in an inner recess R shape, and the surface curvature R2 of the photocatalyst film 75 formed on the side surface 49 is set smaller than the surface curvature R1 of the side surface 49, the inner recess dimension of the photocatalyst film 75 is set. Therefore, it is possible to effectively prevent dirt such as fouling from accumulating in the indented portion of the photocatalyst film 75.

  If the photocatalyst film 75 is formed on the inner surface 51 so that the recess 81 is formed on the inner surface 51 of the small blade 31 and bites into the recess 81, the photocatalyst film 75 can be effectively prevented from falling off from the inner surface 51. It is possible to obtain an organic substance decomposing action and an antibacterial action derived from the photocatalytic film 75 for a longer period. Further, there is an advantage that the amount of the photocatalyst at the inner surface 51 portion can be increased by the amount of the depression 81.

  When the fine irregularities 82 are formed on the surface of the inner surface 51 of the small blade 31 and the photocatalytic film 75 is formed on the inner surface 51 so as to cover the minute irregularities 82, the photocatalytic film from the inner surface 51 is formed as in the case of the concave portion 81. 75 can be effectively prevented from falling off, so that an organic substance decomposing action and an antibacterial action derived from the photocatalytic film 75 can be obtained over a longer period of time.

  The cut body 11 has a curved wall 120 bent in an inverted U shape, and a pair of mounting walls 121 provided continuously to the curved wall 120 and attached to the holding body 19. The thickness of the photocatalyst film 75 formed on the inner surface of the mounting wall 121 can be gradually increased from the curved wall 120 to the mounting wall 121. As described above, when the thickness of the photocatalyst film 75 is gradually increased from the curved wall 120 toward the mounting wall 121, the photocatalyst film 75 is formed and the cut wall 11 on the curved wall 120 side is thus formed. Since it is possible to prevent the weight from becoming excessively large, an increase in the moment of inertia acting on the upper side of the cut body 11 during reciprocating drive is suppressed, and the curved wall 120 of the cut body 11 is prevented from being bent and deformed. be able to.

  The photocatalyst film 75 is preferably composed of a hydrophilic catalyst, whereby a photocatalyst film 75 that exhibits an excellent organic substance decomposing action and antibacterial action during washing with water can be obtained.

It is a vertical side view of the small blade of the inner blade (cut body) in the electric shaver according to the first embodiment of the present invention. It is a front view of the electric razor of 1st Example. It is the sectional view on the AA line of FIG. It is a vertical side view which shows the manufacturing method of the inner blade of 1st Example. It is a top view which shows the manufacturing method of the inner blade of 1st Example. (A), (b) is a figure for demonstrating the manufacturing method of the inner blade of 1st Example. It is a figure for demonstrating the manufacturing method of the inner blade of 1st Example. (A)-(c) is a figure for demonstrating the manufacturing method of the inner blade of 1st Example, and is a figure which shows the formation example of a crimping protrusion. It is a figure for demonstrating the manufacturing method of the inner blade of 1st Example, and is sectional drawing which shows the press-fitting form with respect to a disc and a shaft main body. It is a figure for demonstrating the manufacturing method of the inner blade of 1st Example. It is a front view of the inner blade of 1st Example. It is a figure for demonstrating the manufacturing method of the inner blade of 1st Example. (A)-(d) is a figure for demonstrating the manufacturing method of the inner blade of 1st Example, and is a figure for demonstrating the formation procedure of the base layer with respect to an inner blade. (A)-(d) is a figure for demonstrating the manufacturing method of the inner blade of 1st Example, and is a figure for demonstrating the formation procedure of the photocatalyst layer with respect to an inner blade. It is a vertical side view of the principal part of the electric shaver of 2nd Example. It is a vertical side view of the principal part of the electric shaver of 3rd Example. It is a vertical side view of the principal part of the electric razor of 4th Example. (A)-(c) is a figure which shows the manufacturing method of the inner blade of the electric razor of 4th Example. It is a vertical side view of the small blade of an inner blade in the electric shaver of 5th Example. It is a front view of the principal part of the electric shaver of 5th Example. It is BB sectional drawing of FIG. It is a figure for demonstrating the manufacturing method of the inner blade of 5th Example. It is a figure for demonstrating the manufacturing method of the inner blade of 5th Example. It is a figure for demonstrating the manufacturing method of the inner blade of 5th Example. It is a figure for demonstrating the manufacturing method of the inner blade of 5th Example. It is a figure for demonstrating the manufacturing method of the inner blade of 5th Example. It is a vertical side view of the small blade of an inner blade in the electric shaver of 6th Example. It is a vertical side view of the small blade of an inner blade in the electric shaver of 7th Example. It is a figure for demonstrating the manufacturing method of the inner blade of 8th Example.

(First embodiment)
1 to 14 show a first embodiment in which the electric shaver according to the present invention is applied to a rotary electric shaver. As shown in FIG. 2, the electric razor is disposed on the main body 1, the head 2 supported by the main body 1, the outer frame 3 attached to the main body 1, and the rear surface side of the main body 1. Consists of a shaving unit not shown. The outer frame 3 is provided in order to improve the decorativeness of the electric razor, and constitutes a grip in cooperation with the main body 1. On one side upper part of the outer frame 3, a switch button 5 for turning on / off the energized state of the motor (power source) 4 is provided. In addition to the motor 4, a secondary battery 6, a circuit board 7, and the like are assembled inside the main body 1. In addition to the switch that can be switched by the previous switch button 5, an LED for the indicator lamp 8, a control circuit, a power circuit, and the like are mounted on the circuit board 7. Examples of the power source 4 include a mainspring spring in addition to a motor.

  The head portion 2 is provided with a main blade including an outer blade 10 and an inner blade (cutting body) 11, and further includes a motor 4 that rotationally drives the inner blade 11, and the rotational power of the motor 4 is a rotating blade. A drive structure for transmitting to the blade 11 is provided. The motor 4 is fixed to the lower surface of the head frame and is accommodated in the upper inner surface of the main body 1. The drive structure is composed of a group of gear trains 9, and the rotational power around the vertical axis of the motor 4 is converted into rotational power around the horizontal axis and transmitted to the inner blade 11. The inner blade 11 is rotationally driven in the direction of the arrow shown in FIG. 3 (counterclockwise direction). The outer blade 10 is composed of a sheet-like mesh blade formed by an etching method or an electroforming method, and the front and rear edges thereof are supported by the outer blade holder 12 and held in an inverted U shape. FIG. 3 shows an outer blade 10 formed by electroforming. Reference numeral 13 denotes a cutting edge of the outer blade 10. The head portion 2 is supported by the main body portion 1 so as to be movable up and down, and the space between the two is sealed with a waterproof packing.

  The outer blade holder 12 is detachably attached to the head frame 14, and is locked and held in a non-separable manner by a lock structure not shown. When the pair of left and right lock release buttons 15 and 15 provided on the head frame 14 are pushed in at the same time, the lock structure is unlocked, and the outer blade holder 12 can be removed from the head frame 14 to expose the inner blade 11. . In this state, the hair adhering to the upper surface of the head frame 14 and the inner blade 11 can be washed with water.

  As shown in FIGS. 3, 10, and 11, the inner blade 11 includes a cutting blade blank (plate) 28 and a holding body 19 that holds the cutting blade blank 28. The holding body 19 is a rotating shaft body 20 and includes a shaft main body 22 and five disks 23 that are press-fitted and fixed to the shaft main body 22. The shaft body 22 is formed into a round shaft by turning a martensitic stainless steel material, and the disk 23 is formed into a disk shape by turning the austenitic stainless steel material.

  In order to press-fit (clamp and fix) the disk 23 to the shaft body 22, a plurality of caulking protrusions 24 are formed around the shaft body 22 corresponding to the fixing positions of the disks 23. The caulking protrusions 24 are formed by staking the periphery of the shaft body 22. In this embodiment, rib-shaped caulking protrusions 24 are formed at four positions in the circumferential direction for each fixing position of each disk 23. (See FIG. 8 (c)). As shown in FIG. 9, the caulking protrusions 24 are formed in an intermittent state at five positions in the central axis direction of the shaft body 22, and the length of the caulking protrusions 24 in the central axis direction is the thickness dimension of the disk 23. 2.5 times. Details of the staking process will be described later.

  A loading hole 25 inserted through the shaft body 22 is formed in the center of the disk-shaped disk 23, and a relief groove corresponding to the caulking protrusion 24 is formed on the inner surface of the loading hole 25. A circular blade receiving surface 26 is formed on the peripheral surface of the disk 23, and the cutting blade 21 is welded to the peripheral surface of the blade receiving surface 26.

  The cutting blade 21 is formed into a cylindrical shape by subjecting a martensitic stainless steel plate to etching and further rolling (plastic processing). Details of the processing will be described later. As shown in FIG. 5, the etched plate-shaped blank 27 includes a group of first blades (small blades) 31a, a group of second blades (small blades) 31b, and both blades 31a. A group of rhombus blade holes 33 surrounded by 31b and a peripheral frame 34 surrounding these are formed. A group of both small blades 31 (31a and 31b) is formed in a state in which they are inclined in opposite directions with respect to the central axis of the rotary shaft body 20, and the entire plate blank 27 in the expanded state is thereby expanded. It has a metal appearance.

  As described above, when the plate-shaped blank 27 is formed in an expanded metal shape, the total length of the cutting blade can be increased and the two small blades having different inclination directions compared to a conventional rotating blade having a spiral blade as a cutting element. By 31 (31a, 31b), the cutting object can be cut alternately. Furthermore, since the opening area of the blade hole 33 is remarkably large, the cutting object can be effectively introduced into the blade hole 33 and can be cut efficiently, similarly to the inner blade having a spiral blade as a cutting element.

  Next, the detail of the manufacturing method of the inner blade 11 is demonstrated. The manufacturing process of the inner blade 11 that is a rotary blade includes a step of forming the rotary shaft body 20, a step of forming the cutting blade 21 and fixing it to the rotary shaft body 20, and a step of forming the photocatalytic film 75 on the cutting blade 21. Can be broadly divided. The step of forming the rotating shaft body 20 includes a step of forming a caulking projection 24 around the shaft body 22, a step of forming a loading hole 25 in the disk 23, and a press-fit posture by inserting the disk 23 into the shaft body 22. And the step of relatively fitting the disk 23 and the shaft main body 22 to press-fit the caulking protrusion 24.

  As shown in FIGS. 4 and 5, the step of forming the cutting blade 21 is performed by etching the stainless steel plate material 46 to form the plate blank 27, and the plate blank 27 is rolled onto the plate blank 27 as shown in FIG. And forming a cylindrical cutting blade blank 28 by performing processing (plastic processing). After that, a rotary blade blank 29 is formed through a process of welding the cutting blade blank 28 to the rotary shaft body 20, and the rotary blade blank 29 is subjected to quenching and grinding processing to complete the inner blade 11 which is a rotary blade. To do. The plate-shaped blank 27 may be formed by punching a stainless steel plate material.

(Process for forming loading holes)
In this step, a stainless steel round shaft is cut to form a turning blank having a predetermined diameter value, and the loading hole 25 is formed by turning or drilling the center of the obtained turning blank. The obtained long blank is cut into a predetermined width with a cutting tool to form a disk 23. The disk 23 can be formed by punching a stainless steel plate or can be formed by etching a stainless steel plate.

(Process for forming caulking protrusions)
As shown in FIG. 8, in the step of forming the caulking projection 24, the stationary staking process fixed mold 35 and the staking process movable mold 36 that descends or rises toward the fixed mold 35. Thus, long rib-shaped caulking projections 24 in the central axis direction are formed on the peripheral surface of the shaft main body 22. As shown in FIG. 8B, acute-angle cutting blades 37 and 37 are formed on the front and rear sides of the opposed surfaces of the fixed die 35 and the movable die 36, respectively. With the cutting blade 37 of the fixed die 35 supporting the shaft main body 22 on which the disk 23 is temporarily assembled, the movable die 36 is pivoted while the shaft main body 22 is positioned by the positioning frame 38 provided on the side end of the fixed die 35. By biting into the peripheral surface of the main body 22, rib-shaped caulking protrusions 24 protruding in an inverted V shape can be formed at four locations in the circumferential direction of the shaft main body 22 as shown in FIG. The caulking protrusions 24 are formed intermittently at regular intervals along the central axis direction of the shaft body 22 for each fixing position of each disk 23, but the phase position of each caulking protrusion 24 at the fixing position of each disk 23. Are aligned at a certain position. At the same time that the caulking projection 24 is formed, a biting mark 39 of the cutting edge 37 is formed.

(Process for press-fitting caulking protrusions)
In this step, as shown in FIG. 9, the disk 23 temporarily assembled to the shaft body 22 is supported by the support wall 41 of the jig 40. In this state, the shaft main body 22 is pushed downward along the central axis, and the lower end surface of the shaft main body 22 is circumscribed by the stopper 42 at the lower end of the jig 40, so that the caulking protrusion 24 and the loading hole 25 are press-fitted together. Thus, the portion on the projecting end side of the caulking projection 24 where the loading hole 25 has passed is scraped off by the loading hole 25, or conversely, a portion of the loading hole 25 is crushed on the base side of the remaining caulking projection 24. The disc 23 can be press-fitted and fixed to the shaft main body 22 because the two 24 and 25 are in close contact with each other.

(Process of forming the cutting blade)
In this step, as shown in FIGS. 4 and 5, the stainless steel plate 46 is etched to form the plate-shaped blank 27 of the cutting blade 21. Specifically, the front and back surfaces of the stainless steel plate 46 having a thickness of 0.3 mm are etched to form the small blades 31 (31a and 31b) and the like. In the etching step, as shown in FIG. 4, a resist film 47 is formed on both front and back surfaces of the stainless steel plate 46, and then exposed, the exposed portion is removed, and the surface of the plate material surrounded by the non-exposed portion is etched with an etching solution. At this time, a large number of plate-shaped blanks 27 are formed at the same time, and the bridging portions 48 provided on the side portions are cut to separate the plate-shaped blanks 27 from the stainless steel plate material 46.

  By performing the etching process, a small blade 31 having a cross-sectional shape as shown in FIG. 4 is formed. The small blade 31 is divided into four parts: a cut surface 50 on the outer surface, a base surface 51 on the inner surface, and a scooping surface 52 and a scooping surface 53 formed in an indented shape on the side surface between the end edges of both of them. It is formed in a modified cross-sectional shape with corners. The side surface 49 of the blade 31 is formed by the scooping surface 52 and the scooping surface 53. A cutting edge 54 is formed at a protruding end (edge) of the cutting surface 50 indicated by an arrow on the rotation direction side, and a scooping surface 52 is formed on the side surface of the small blade 31 continuously to the cutting edge 54. In addition, a clearance edge 55 is formed on the opposite edge of the blade edge 54, and a turning surface 53 is formed on the side surface of the small blade 31 continuously to the clearance edge 55. The scooping surface 52 and the scooping surface 53 are formed as one concave curved surface extending from the edge of the cut surface 50 to the edge of the base surface 51. As an etchant, ferric chloride can be used. By this etching process, minute irregularities 82 are formed on the surface of the scooping surface 52 and the scooping surface 53 that are not covered with the resist film 47.

(Process of forming a cutting blade blank)
In this step, as shown in FIGS. 6A and 6B, the plate-shaped blank 27 is subjected to roll processing (plastic processing) to form a cylindrical cutting blade blank 28. Roll processing is performed by two base rollers 56 and 56 disposed on the lower side and a pressure roller 57 disposed above both base rollers 56 and 56, and a plate is disposed between both rollers 56 and 57. By passing the shaped blank 27, a cylindrical cutting blade blank 28 is formed. The cutting blade blank 28 is curved into an incomplete cylinder having a slit 58.

(Process of welding the cutting blade blank)
In this step, the cutting blade blank 28 of the cutting blade 21 is welded to the peripheral surface of the disk 23 of the rotary shaft body 20. Specifically, a cylindrical cutting blade blank 28 is externally fitted to the disk 23, and the cutting blade blank 28 is held with a jig having a semicircular cross section and is brought into close contact with the blade receiving surface 26 of the disk 23. In this state, the cutting blade blank 28 is welded to the disk 23 with a laser welding machine, whereby a cylindrical blade-shaped rotating blade blank 29 as shown in FIG. 11 is obtained.

(Heat treatment process)
In the heat treatment step, the rotary blade blank 29 is heated to about 1000 ° C., and after maintaining the state for a predetermined time, quenching is performed by sequentially cooling with water and heated oil. Thereby, the metal structure of the cutting blade 21 and the shaft body 22 can be martensitic, and the surface hardness can be enhanced. By heating the rotary blade blank 29, it is possible to remove internal distortion caused by heat generated at the periphery of the weld during laser welding. Temper as necessary.

(Polishing process)
In the polishing process, rough grinding and finish grinding are sequentially performed on the peripheral surface of the rotary blade blank 29 to improve the roundness of the peripheral surface of the cutting blade 21 and further sharpen the cutting edge 54. In the rough grinding process, the bulging surface of the welded portion is removed, and at the same time, the surface of the cutting blade 21 is ground. Further, in the finish grinding process, finish grinding is performed so that the surface roughness of the peripheral surface of the cutting blade 21 is reduced, and the diameter, roundness, and surface roughness of the outer peripheral surface of the inner blade 11 that is a rotary blade are performed. And finish in a predetermined state. In the rough grinding process, the bulging surface of the welded portion that is easily corroded is removed, so that the durability of the cutting blade 21 can be improved by removing the corrosion and cracking of the welded portion. As shown in FIG. 12, the polishing step can be performed by rotating the polishing roller 59 and the rotary blade blank 29 in the same direction while pressing the polishing roller 59 against the surface of the cutting blade 21. However, polishing may be performed by performing electrolytic polishing on the cutting blade 21. If the required specification for the roundness of the inner cutter 11 is low, the grinding process can be omitted.

(Photocatalyst formation process)
The formation process of the photocatalyst film is largely divided into a formation process of the underlayer 60 as shown in FIGS. 13A to 13D and a formation process of the photocatalyst layer 61 as shown in FIGS. 14A to 14D. Can be separated. In the formation process of the foundation layer 60, first, a chemical treatment (etching treatment) is performed in which the rotary blade blank 29 is immersed in an acidic solution (chemical polishing solution) containing an inorganic acid as a main component for a predetermined time. By such chemical treatment, a passive film is formed on the surfaces of the cutting surface 50, the base surface 51, the scooping surface 52, and the scoring surface 53 of the small blade 31, and fine irregularities 82 in the order of μm are formed on the surface. Is formed (see FIG. 1). Such fine irregularities 82 are formed by chemical treatment with an acidic solution prior to the formation of the photocatalytic film 75. Thus, when a passive film is formed, it can prevent effectively that each surface is corroded. Further, the formation of the minute irregularities 82 increases the adhesion of the photocatalyst film 75 and prevents the photocatalyst film 75 from being accidentally dropped off. In addition, in such chemical treatment, minute irregularities are also formed on the surface of the rotating shaft 20. Therefore, the adhesiveness of the photocatalyst film 75 on the surface of the rotary shaft body 20 is increased similarly to the small blade 31, and the photocatalyst film 75 can be prevented from being accidentally dropped off. Specific examples of the chemical polishing liquid include known deburring agents in addition to ferric chloride (etching liquid) used in forming the plate blank 27 of the cut 21. Further, the chemical treatment can be carried out by spraying the acidic solution onto the rotary blade blank 29 with a spraying device or the like, in addition to being immersed in the acidic solution.

  Next, as shown in FIG. 13A, the rotary blade blank 29 is immersed in a binder tank 63 filled with the binder resin 62 constituting the base layer 60 for a predetermined time, and the entire surface of the rotary blade blank 29 is immersed. A binder resin 62 is adhered. Thus, the binder resin 62 can be attached to the surface of the small blade 31 constituted by the cut surface 50, the base surface 51, the scooping surface 52, and the scooping surface 53 with a substantially uniform thickness dimension.

  Next, as shown in FIG. 13B, a process for removing excess binder resin 62 adhering to the blade edge 54 and a process for thinning the base layer 60 made of the binder resin 62 are performed. Here, first, the rotary blade blank 29 is rotated around the shaft body 22 for a predetermined time (about 10 seconds), whereby the binder resin 62 is moved to the outer surface side of the small blade 31 by the centrifugal separation force, and an excess binder is used. Resin 62 is removed. Next, after arranging the blower outlet 65 of the blower so as to face the cutting edge 54 positioned at the uppermost part of the cutting blade 21, the rotary blade blank is arranged in the same direction (counterclockwise) as the rotation direction of the inner blade 11. While removing the rotation 29 about the shaft body 22, the removal air 66 of the binder resin 62 is fed from the outlet 65 (about 3 seconds). The air outlet 65 having a flat nozzle opening is located on a tangent line extending from the uppermost part of the cutting blade 21 and is downstream in the rotational direction of the cutting edge 54 of the uppermost cutting blade 21 (left side in the illustrated example). ). In this way, the binder resin 62 adhering to the blade edge 54 can be removed by supplying the removal air 66 from the downstream side in the rotation direction toward the blade edge 54 while rotating the cutting blade 21. Further, the removed air 66 can push the binder resin 62 adhering to the blade edge 54 to the lower side of the scooping surface 52. Therefore, the layer thickness of the binder resin 62 adhering to the scooping surface 52 can be gradually increased as the blade edge 54 side is thin and the blade edge 54 is separated.

  Next, as shown in FIG.13 (c), using the baking apparatus 67, it heat-processes with respect to the rotary blade blank 29 to which the binder resin 62 adheres (120-150 degreeC), and the binder resin 62 is solidified. Then, the base layer 60 is formed on the surface of the small blade 31. Next, as shown in FIG.13 (d), the rotary blade blank 29 is accommodated in the temperature-controlled room 68 maintained at 60 degreeC for predetermined time (about 10 minutes), and the rotary blade blank 29 is warmed. When the rotary blade blank 29 is warmed in this manner, the photocatalyst layer 61 adheres well to the underlayer 60 in the next step.

  In the subsequent step of forming the photocatalyst layer 61, first, as shown in FIG. 14A, the rotary blade blank 29 on which the base layer 60 was formed in the previous step is placed in the catalyst tank 70 filled with the liquid photocatalyst 71. The photocatalyst 71 is attached to the entire surface of the foundation layer 60 by dipping for a predetermined time. In this state, the photocatalyst 71 is attached to the surface of the foundation layer 60 with a substantially uniform thickness dimension. The photocatalyst 71 is preferably a hydrophilic catalyst, whereby the photocatalyst film 75 that exhibits an excellent organic substance decomposing action and antibacterial action during washing with water can be formed.

  Next, the removal process of the excess photocatalyst 71 adhering to the blade edge | tip 54 and the thinning process of the photocatalyst layer 61 comprised with the photocatalyst 71 are performed (refer FIG.14 (b)). The method of the removal process and the thinning process is the same as that in FIG. That is, first, the rotary blade blank 29 is rotated around the shaft body 22 for a predetermined time (about 10 seconds), the photocatalyst 71 is moved to the outer surface side of the cutting blade 21 by centrifugal force, and the excess photocatalyst 71 is removed. To do. Next, after arranging the blower outlet 72 of the blower so as to face the uppermost blade edge 54 of the cutting blade 21, the rotary blade blank 29 is placed in the same direction (counterclockwise) as the rotation direction of the inner blade 11. While rotating around the shaft body 22, the removal air 73 of the photocatalyst 71 is fed from the outlet 72 (about 3 seconds). The blower outlet 72 having a flat nozzle opening is located on a tangent line extending from the uppermost part of the cutting blade 21 and is downstream in the rotation direction of the cutting edge 54 of the uppermost cutting blade 21 (left side in the illustrated example). ). Thus, the photocatalyst 71 adhering to the blade edge 54 is removed by supplying the removal air 73 from the downstream side in the rotation direction toward the blade edge 54 of the cutting blade 21 while rotating the cutting blade 21. Can do. Further, the removal air 73 can push the photocatalyst 71 adhering to the blade edge 54 to the lower side of the scooping surface 52. Therefore, the layer thickness of the photocatalyst 71 adhering to the surface of the base layer 60 of the scooping surface 52 can be made gradually thicker as the blade edge 54 side is thinner and away from the blade edge 54.

  Next, as shown in FIG.14 (c), using the baking apparatus 67, it heat-processes with respect to the rotary blade blank 29 to which photocatalyst 71 adheres (120-150 degreeC), solidifies photocatalyst 71, A photocatalytic layer 61 is formed on the underlayer 60. Finally, as shown in FIG. 14 (d), the grinding roller 74 and the rotary blade blank 29 are rotated in the same direction with the cutting surface 50 pressed against the polishing roller 74, thereby forming on the cutting surface 50. The underlying layer 60 and photocatalyst layer 61 thus formed are removed. From the above, the inner blade 11 as shown in FIG. 14D and FIG. 1 can be obtained. In addition, the removal operation | work of the base layer 60 and the photocatalyst layer 61 which were formed on the cut surface 50 in FIG.14 (d) can be abolished. This is because when the inner blade 11 is driven and rotated with the outer blade 10 mounted, the base layer 60 and the photocatalyst layer 61 formed on the cut surface 50 are removed by contact with the outer blade 10. .

(Inner blade configuration)
As shown in FIG. 1, the small blades 31 (31 a and 31 b) of the inner blade 11 have inner recesses on the outer cut surface 50, the inner base surface 51, and the side surfaces between the edges of the both 50 and 51. The scooping surface 52 and the scooping surface 53 are formed in a deformed cross section having four corners, and the cutting edge 50 is provided with a cutting edge 54 at the protruding end on the rotation direction side. The scooping surface 52 and the scooping surface 53 are formed as one concave curved surface extending from the edge of the cut surface 50 to the edge of the base surface 51, and the scooping surface 52, the scooping surface 53, and the surface of the base surface 51 are formed. Then, a photocatalytic film 75 having an indented shape composed of the base layer 60 and the photocatalyst layer 61 is formed.

  In addition, the thickness of the photocatalyst film 75 formed on the surface of the scooping surface 52 is thin on the blade edge 54 side by performing the above-described removal processing and thinning processing of FIG. 13B and FIG. 14B. As the distance from the blade edge 54 increases, the thickness gradually increases. More specifically, the film thickness of the photocatalytic film 75 on the scooping surface 52 is thin on the blade edge 54 side and gradually increases as it approaches the most concave portion 52a of the scooping surface 52, and passes through the most concave portion 52a. As the surface 51 is approached, it gradually becomes thinner. In FIG. 1, the dimension (D1) indicates the maximum film thickness dimension of the photocatalytic film 75 in the most concave portion 52a. Further, the surface curvature (R2) of the photocatalytic film 75 is smaller than the surface curvature (R1) of the scooping surface 52.

  The thickness dimension of the photocatalyst film 75 formed on the surface of the flange surface 53 is uniform, and the dimension (D2) in FIG. 1 indicates the film thickness dimension of the photocatalyst film 75 formed on the flange surface 53. The surface curvature (R4) of the photocatalyst film 75 is larger than the surface curvature (R3) of the turning surface 53. The maximum thickness dimension (D3) of the photocatalyst film 75 formed on the surface of the base surface 51 is larger than the maximum thickness dimension (D1) of the photocatalyst film 75 formed on the scooping surface 52.

  As described above, according to the electric razor according to the first embodiment, since the photocatalytic film 75 is formed on the scooping surface 52 and the like constituting the inner blade 11, the head portion is formed by the organic matter decomposing action and antibacterial action of the photocatalytic film 75. The inside of 2 can be kept in a hygienic state. In addition, since the thickness dimension of the photocatalytic film 75 formed on the surface of the scooping surface 52 is thin on the blade edge 54 side and gradually increases as the distance from the blade edge 54 increases, the photocatalytic film 75 adheres to the blade edge 54. This can prevent the cutting ability of the inner blade 11 from being lowered. From the above, it is possible to obtain an electric razor having a good organic matter decomposing action and antibacterial action of the photocatalytic film 75 without impairing the cutting ability (sharpness).

  Since the scooping surface 52 is formed in an indented curved shape on the side surface of the small blade 31 (the first small blade 31 a and the second small blade 31 b) continuously to the cutting edge 54, the contact between the photocatalytic film 75 and the scooping surface 52. By increasing the area, it is possible to reliably prevent the photocatalytic film 75 from falling off the scooping surface 52. Moreover, since the surface curvature (R2) of the photocatalyst film 75 is made smaller than the surface curvature (R1) of the scooping surface 52, the size of the inner recess of the photocatalyst film 75 can be reduced. As a result, it is possible to effectively prevent dirt such as debris from accumulating in the indented portion of the photocatalytic film 75.

  If the photocatalyst film 75 is formed on the surface of the base surface 51 in addition to the surface of the scooping surface 52, the hard-to-clean portion of the inner blade 11 can be covered with the photocatalyst film 75. The inside of the head part 2 can be sterilized and washed by utilizing the decomposition action and the antibacterial action. In particular, if the thickness (D3) of the photocatalyst film 75 formed on the surface of the base surface 51 is larger than the maximum thickness (D1) of the photocatalyst film 75 formed on the surface of the scooping surface 52, the base The organic matter decomposing action and antibacterial action derived from the photocatalytic film 75 on the surface 51 side can be obtained over a longer period. In addition, since the micro unevenness 82 is formed on the surface of the base surface 51 and the photocatalyst film 75 is formed so as to cover the micro unevenness 82, the photocatalytic film 75 is eaten into the recess of the micro unevenness 82. The photocatalytic film 75 can be effectively prevented from falling off the base surface 51. Accordingly, it is possible to obtain an organic substance decomposing action and an antibacterial action derived from the photocatalytic film 75 over a longer period of time.

  When the maximum thickness dimension (D2) of the photocatalyst film 75 formed on the face 53 is larger than the maximum thickness (D1) of the photocatalyst film 75 formed on the face 52, the photocatalyst on the face 53 side is formed. The organic matter decomposing action and antibacterial action derived from the film 75 can be obtained over a longer period of time.

  Further, according to this electric razor, the photocatalytic film 75 is also formed on the surface of the rotary shaft 20 constituting the inner blade 11. Therefore, similarly to the blade 31, the organic matter decomposing action and the antibacterial action derived from the photocatalyst film 75 are also exerted on the hair adhering to the rotary shaft body 20.

(Second embodiment)
FIG. 15 shows a second embodiment of the present invention. The small blade 31 of the inner blade 11 shown in FIG. 15 is different from the inner blade of the first embodiment in that the turning surface 53 is formed in a square shape with two concave curved surfaces. That is, the point which comprised the turning surface 53 by the 1st turning surface 80a and the 2nd turning surface 80b is different from the previous 1st Example. Since the other points are the same as those of the first embodiment, the same members are denoted by the same reference numerals and the description thereof is omitted.

(Third embodiment)
FIG. 16 shows a third embodiment of the present invention. The small blade 31 of the inner blade 11 shown in FIG. 16 has a point that a recess 81a is formed on the cut surface 50 by half etching, a point that a recess 81b is formed on the base surface 51 by half etching, and the recesses 81a and 81b. The point that the photocatalyst film 75 is formed so as to fill the inside is different from the first embodiment. Since the other points are the same as those of the first embodiment, the same members are denoted by the same reference numerals and the description thereof is omitted. As described above, when the recesses 81a and 81b are formed in the cut surface 50 and the base surface 51, it is possible to effectively prevent the photocatalytic film 75 from dropping from the cut surface 50 and the like. The organic substance decomposing action and antibacterial action derived from the photocatalytic film 75 can be obtained.

(Fourth embodiment)
17 and 18 show a fourth embodiment of the present invention. In this 4th Example, the point which formed the scooping surface 52 and the scooping surface 53 formed in the side surface of the small blade 31 by the linear slope 88 * 89, and the point which formed the recessed part 81a in the cut surface 50 are the points. This is different from the first embodiment. Since the other points are the same as those of the first embodiment, the same members are denoted by the same reference numerals and the description thereof is omitted.

  The inner blade 11 can be formed by subjecting a plate-shaped blade blank 83 formed by electroforming to press working, formation of a photocatalytic film 75, polishing treatment, and the like. Specifically, as shown in FIG. 18A, a photoresist film is formed on the upper surface of the mother die 84, a pattern film is placed on the surface, exposed and developed, and then a photoresist that matches the electroformed pattern. The layer 85 is formed, and the primary electroformed layer 86 is formed. Next, as shown in FIG. 18B, the secondary electroformed layer 87 is formed on the outer surface of the primary electroformed layer 86 while flowing the electroforming solution in the direction indicated by the arrow. By peeling off the secondary electroformed layer 87, a blade blank 83 provided with the small blade 31 having a trapezoidal cross section is obtained. Specifically, it is possible to form the unequal-leg trapezoidal blade 31 having a small inclination angle of the slope 88 on the upper side in the flow direction of the electroforming liquid and a large inclination angle of the slope 89 on the lower side in the flow direction.

  Next, the secondary electroformed layer 87 is peeled off to obtain a blade blank 83 as shown in FIG. Next, after pressing the blade blank 83 to plastically deform the whole into a curved shape to form the cylindrical cutting blade blank 28, the photocatalytic film 75 is formed in the same procedure as in the first embodiment. The inner blade 11 as shown in FIG. 17 can be obtained by forming and polishing.

  As shown in FIG. 17, the small blade 31 of the inner blade 11 includes a scooping surface 52 composed of a slope 88 with a small inclination angle and a scooping surface 53 composed of a slope 89 with a large inclination angle. On the 50 side, a recess 81 a corresponding to the primary electroformed layer 87 is provided. The protruding edge of the cut surface 50 becomes the cutting edge 54. A photocatalytic film 75 is formed on the surface of the base surface 51, the scooping surface 52, and the scooping surface 53. A photocatalytic film 75 is also formed in the recess 81 a of the cut surface 50. The thickness dimension of the photocatalytic film 75 on the scooping surface 52 is such that the blade edge 54 side is thin, and the thickness dimension gradually increases as the distance from the blade edge 54 increases.

(5th Example)
19 to 26 show a fifth embodiment in which the present invention is applied to a reciprocating electric shaver. As shown in FIGS. 19 and 20, the head portion 2 of the electric razor includes a head frame 14, a motor 4 fixed to the lower portion thereof, a cutting mechanism 100 disposed on the upper portion of the head portion 2, and the motor 4. A driving structure 101 that transmits power to the cutting mechanism 100 and an outer blade holder 12 that is attached to and detached from the head frame 14 are configured. The cutting mechanism 100 includes a laterally long outer blade 10 and a laterally long inner blade (cut body) 11 that is reciprocated to the left and right along the inner surface of the outer blade 10. The outer blade 10 is a sheet-like mesh blade formed by electroforming or etching, and is held in an inverted U shape by the outer blade holder 12. The inner blade 11 is formed of a slit blade that is pressed into a plate-shaped blank 27 and bent into an inverted U shape, and is fixed in an inverted U shape by an inner blade holder 110 that is a holding body 19. The plate blank 27 is formed by an etching method as will be described later.

  A drive structure 101 that reciprocates the inner blade 11 includes an eccentric cam 102 that is fixed to the output shaft of the motor 4, a vibrator 103, and a drive shaft 104 that protrudes from the upper center of the vibrator 103. . The rotational power of the motor 4 is converted into reciprocating power by the eccentric cam 102 and the vibrator 103 and transmitted to the inner blade 11 through the drive shaft 104. The inner blade 11 is pushed up and biased by a compression coil spring 105 disposed between the vibrator 103 and the inner blade holder 110, and is always in close contact with the inner surface of the outer blade 10.

  Next, the detail of the manufacturing method of the inner blade 11 is demonstrated. The manufacturing process of the inner blade 11 which is a reciprocating drive blade includes a step of forming the plate blank 27, a step of pressing the plate blank 27 to form the cutting blade blank 28, and a surface of the cutting blade blank 28. The process can be roughly divided into a process of forming the photocatalyst film 75 and a process of fixing the cutting blade blank 28 on which the photocatalyst film 75 is formed to the inner blade holder 110.

  As shown in FIG. 23, the plate-shaped blank 27 is composed of a horizontally long plate body, and rib-shaped small blades 31 and slit-shaped blade holes 33 are alternately formed in the left-right direction on the wall surface of the plate body. ing. As shown in FIG. 19, the blade 31 has an inverted isosceles trapezoidal cross section with a cut surface 50 on the outer surface, a base surface 51 on the inner surface, and left and right scooping surfaces 52 and 52 curved in an inner recess shape. Formed as follows. Along with this, sharp edges 54 are formed on the left and right side edges of the cutting surface 50, respectively, and these cutting edges 54 cooperate with the outer blade 10 to cut the beard. A photocatalytic film 75 is formed on the surfaces of the cut surface 50, the base surface 51, and the left and right scooping surfaces 52 and 52. In FIG. 19, the photocatalyst film 75 formed on the cut surface 50 is omitted. This is because the photocatalytic film 75 formed on the cut surface 50 is removed by contact with the outer blade 10 when the inner blade 11 is driven to reciprocate with the outer blade 10 mounted.

  The plate-shaped blank 27 is formed by etching the stainless steel plate 46 having a thickness of 0.25 mm. In the process, the surfaces 50, 51, and 52 constituting the blade 31 are formed. First, as shown in FIG. 22, in the etching process, resist films 47 and 47 are formed on the front and back surfaces of the stainless steel plate 46, respectively, and then exposed, the exposed portion is removed, and the surface of the plate surrounded by the resist pattern is etched with an etching solution. Etch. The resist pattern on the back side is slightly smaller than the resist pattern on the front side. Therefore, the degree of etching on the back surface side becomes larger than the surface of the stainless steel plate material 46. The curved surface grown from the front surface (cut surface 50) side by the etching and the curved surface grown from the back surface (base surface 51) side finally become one curved surface to form a scooping surface 52. As the degree of etching on the side is larger, the taper is tapered toward the back side. As a result, the entire cross section of the small blade 31 is formed in an inverted isosceles trapezoid shape. At this time, as shown in FIG. 23, a large number of plate-shaped blanks 27 are formed at the same time, and the bridging portions 48 provided on the side portions are cut to separate the plate-shaped blanks 27 from the stainless steel plate material 46. . In FIG. 23, reference numeral 114 denotes a mounting hole for mounting to the inner blade holder 110.

  Next, as shown in FIG. 24, with the plate-shaped blank 27 set on the lower mold 116 having a U-shaped groove, the upper mold 118 having the convex spherical portion 117 is pressed against the plate-shaped blank 27 from above. The plate-shaped blank 27 is pressed and plastically deformed into a U-shaped cross section. Thus, a cutting blade blank 28 including a curved wall 120 bent in an inverted U shape and a pair of mounting walls 121 provided continuously to the curved wall 120 and attached to the inner blade holder 110 is obtained. Can do.

  Next, a chemical treatment is performed in which the cutting blade blank 28 is immersed in an acidic solution for a predetermined time to form micro unevenness of μm order on the surface of the cutting blade blank 28. Then, as shown in FIG. The cutting blade blank 28 is immersed for a predetermined time in the catalyst tank 113 filled with the catalyst solution 112 formed by mixing the catalyst solution 112 to the entire surface of the cutting blade blank 28. Thus, the catalyst liquid 112 can be attached to the surface of the small blade 31 constituted by the cut surface 50, the base surface 51, and the scooping surfaces 52 and 52 with substantially uniform dimensions. The binder resin and photocatalyst contained in the catalyst liquid 112 are the same as those described in the first embodiment, and a hydrophilic catalyst is suitable as the photocatalyst.

  Next, as shown in FIG. 25, the cutting blade blank 28 is left for a predetermined time in a posture state in which the curved wall 120 is directed upward. Thus, in the small blade 31 constituting the curved wall 120, the catalyst liquid 112 attached to the upper end (blade edge 54) of the scooping surface 52 moves downward under its own weight. Therefore, the film thickness of the catalyst liquid 112 on the scooping surface 52 is thin on the blade edge 54 side and gradually increases as the distance from the blade edge 54 increases (see FIGS. 19 and 25). Further, the film thickness of the catalyst liquid 112 adhering to the base surface 51 is thick at the center and thin at the periphery due to surface tension. In addition, when the catalyst liquid 112 moves downward under its own weight, the thickness dimension (D4) of the catalyst liquid 112 adhering to the curved wall 120 of the cutting blade blank 28 is the thickness dimension of the catalyst liquid 112 adhering to the mounting wall 121. This is smaller than (D5) (see FIG. 21).

  The downward movement of the catalyst liquid 112 is not limited to movement due to its own weight, and a method of actively moving the catalyst liquid 112 using a centrifuge can be employed. Specifically, the cutting blade blank 28 to which the catalyst liquid 112 is attached is set in the centrifuge in such a posture that the curved wall 120 side is positioned on the rotation center side of the centrifuge and the mounting wall 121 side is directed outward. However, the catalyst liquid 112 can also be moved to the mounting wall 121 side by rotating the centrifuge. Moreover, since the catalyst liquid 112 adhering to the cutting surface 50 side constituting the small blade 31 of the curved wall 120 can be moved to the base surface 51 side by the rotational drive of the centrifuge, the catalyst liquid on the scooping surface 52 is moved. The film thickness of 112 can be made gradually thicker as the blade edge 54 side is thinner and away from the blade edge 54. Such a method is particularly useful when the viscosity of the catalyst liquid 112 is high.

  Next, using a baking apparatus or the like, the cutting blade blank 28 to which the catalyst liquid 112 is adhered is heated (120 to 150 ° C.) to solidify the catalyst liquid 112, and the photocatalyst is formed on the surface of the cutting blade blank 28. The film 75 is fixed.

  As shown in FIG. 19, the small blade 31 of the inner blade 11 is formed in an indented shape on the cut surface 50 on the outer surface, the base surface 51 on the inner surface, and the side surface between the end edges of both 50 and 51. The scooping surfaces 52 and 52 are formed in an inverted isosceles trapezoidal shape having four corners, and the cutting edges 50 are provided with cutting edges 54 and 54 at the left and right edges. The scooping surface 52 is formed as one concave curved surface extending from the end edge of the cut surface 50 to the end edge of the base surface 51. The scooping surface 52, the cut surface 50, and the base surface 51 have inner concave shapes on the surfaces thereof. A photocatalytic film 75 is formed.

  In this embodiment, the photocatalytic film 75 on the base surface 51 has an outwardly convex R shape. The thickness dimension of the photocatalyst film 75 formed on the surface of the scooping surface 52 is thin on the blade edge 54 side and gradually increases as the distance from the blade edge 54 increases. More specifically, the film thickness dimension of the photocatalytic film 75 on the scooping surface 52 is thin on the blade edge 54 side and gradually increases as it approaches the most concave portion 52a of the scooping surface 52. In FIG. 19, the dimension (D1) indicates the maximum film thickness dimension of the photocatalytic film 75 in the most concave portion 52a. Further, the surface curvature (R2) of the photocatalytic film 75 is smaller than the surface curvature (R1) of the scooping surface 52.

  In addition, as the catalyst liquid 112 moves downward, the thickness dimension (D4) of the photocatalyst film 75 on the curved wall 120 of the inner blade 11 is smaller than the thickness dimension (D5) of the photocatalyst film 75 on the mounting wall 121. (See FIG. 21). More specifically, the thickness of the photocatalytic film 75 gradually increases from the upper curved wall 120 to the lower mounting wall 121. Thus, when the thickness of the photocatalyst film 75 is gradually increased from the upper curved wall 120 to the lower mounting wall 121, the upper side of the cutting blade blank 28 is formed along with the formation of the photocatalyst film 75. It is possible to prevent the weight of the (curved wall 120 side) from becoming excessively large. Thus, an increase in the moment of inertia acting on the upper side of the inner blade 11 during reciprocating drive can be suppressed, so that the curved wall 120 of the cutting blade blank 28 constituting the inner blade 11 is bent and deformed to strain. Can be prevented.

(Sixth embodiment)
FIG. 27 shows a sixth embodiment of the present invention. In the sixth embodiment, the point that the concave portion 81 is formed on the base surface 51 of the small blade 31 by half-etching, and the point that the photocatalytic film 75 is formed so as to fill the concave portion 81 are the fifth point. Different from the embodiment. Since the other points are the same as those of the fifth embodiment, the same members are denoted by the same reference numerals and the description thereof is omitted. As described above, when the concave portion 81 is formed on the base surface 51, the photocatalytic film 75 can be effectively prevented from dropping from the base surface 51, so that the organic matter derived from the photocatalytic film 75 can be used for a longer period of time. Degradation action and antibacterial action can be obtained.

(Seventh embodiment)
FIG. 28 shows a seventh embodiment of the present invention. As shown in FIG. 28, the blade 31 of the present embodiment includes an outer cut surface 50, and a pair of left and right scooping surfaces 52, 52 formed in a tapered shape constricted from the left and right peripheral edges of the cut surface 50, It is formed in a cross-shaped cup shape including an inner base surface 51, right and left peripheral edges of the base surface 51, and straight surfaces 123 and 123 (side surfaces 49) that connect lower ends of the scooping surfaces 52 and 52. A concave portion 137 is formed at the central portion of the straight surfaces 123 and 123 in the vertical direction, and a convex portion 138 is formed at the central portion of the base surface 51 in the horizontal direction. In addition, an inner concave R-shaped concave portion 140 is formed on the side surface of the photocatalyst film 75 corresponding to the concave portion 137 of the straight surface 123, and the photocatalytic film 75 of the photocatalytic film 75 is formed corresponding to the convex portion 138 of the base surface 51. An outer convex R-shaped convex portion 141 is formed on the lower surface.

(Eighth embodiment)
FIG. 29 shows an eighth embodiment of the present invention. In the eighth embodiment, the photocatalytic film 75 is formed on the base surface 51 by applying the catalyst liquid 112 to the base surface 51 by a spray injection method. Specifically, a plate-shaped blank 27 having a small blade 31 is formed by an etching method or press working, and then a masking plate 152 having an opening 151 corresponding to the base surface 51 is pasted on the lower surface of the plate-shaped blank 27. To wear. Next, the atomized catalyst liquid 112 is sprayed from the nozzle 153 toward the base surface 51 through the opening 151 to apply the catalyst liquid 112 to the surface of the base surface 51. Specifically, the mist-like catalyst liquid 112 is ejected from the nozzle 153 while moving the plate-like blank 27 to which the masking plate 152 is adhered in the direction indicated by the arrow, and then the masking plate 152 is removed. Next, the plate-shaped blank 27 is subjected to heat treatment to solidify the catalyst liquid 112, thereby forming a photocatalytic film 75 that covers the base surface 51. FIG. 29 shows an example in which a photocatalytic film 75 is formed by a spray injection method on a plate-shaped blank 27 (see FIG. 1) formed by an etching method.

  The present invention can also be applied to an electric razor provided with a guard body that regulates the amount of biting of the rotary blade around the rotary blade. That is, the present invention can also be applied to an electric razor not provided with an outer blade. The cutting blade blank (plate) 28 is formed into a cylindrical shape or a U-shaped section by plastic processing, but it is not necessary and may be a flat plate shape. When the cutting blade blank 28 is flat, the outer blade 10 is also formed in a flat shape. The flat outer blade 10 and the cutting blade blank 28 are applied to, for example, a reciprocating center blade of an electric razor, or a slash blade composed of a fixed blade and a movable blade in the same manner as a clipper. can do. In the rotary electric shaver according to the first embodiment, the inner blade 11 is not limited to the form of one cutting blade blank 28, and a plurality of partial arc-shaped cutting blade blanks (plates) 28 are prepared, By fixing the plurality of cutting blade blanks 28 to the rotary shaft body 20, the cross section may be an arc shape.

4 Power source (motor)
11 Cutting body (inner blade)
19 Holder 28 Plate (Cut blade blank)
31 Small blade 49 Side surface of small blade (crawl surface 52, grind surface 53)
50 External surface of the blade (cut surface)
51 Inner surface of the blade (base surface)
54 Edge of small blade 75 Photocatalyst film 81 Concave part 82 Micro uneven part 120 Curved wall 121 Mounting wall

Claims (2)

An electric razor comprising a cutting body (11) driven by receiving a driving force from a power source (4),
The cut body (11) is
A small blade (31) is formed by etching the plate material, and a plastic blade is formed on the plate material on which the small blade (31) is formed to form a curved blade blank (28/29). An electric razor comprising a blade having a photocatalyst film (75) formed on a surface of a blank (28, 29). The cut body (11) is
A small blade (31) is formed by etching the plate material, and a plastic blade is formed on the plate material on which the small blade (31) is formed to form a curved blade blank (28/29). The blank (28/29) is further etched.
The electric shaver according to claim 1, further comprising a blade having a photocatalyst film (75) formed on a surface of an etched blade blank (28, 29).

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