受験番号：28IPM0331)[0003]
Problem to be Solved by the Invention
However, even objects with a smooth surface have air resistance, and the fuel economy,acceleration, maximum speed, stability, and the like of transportation such as describedabove are affected by air resistance. In particular, fuel economy is pertinent toenvironmental issues such as the energy resource problem, pollution, acid rain, andglobal warming, with increases in the energy used for transportation further
highlighting these problems. Also, objects that fly at ultra-high speeds experienceproblematic heating via friction with the air (aerodynamic heating). For example, a space
shuttle can reach speeds of 7.6 km/s when re-entering the atmosphere, the frictional
heating from this causing the surface temperature at some sections to reachtemperatures of 1400°C or higher. Accordingly, the development of heat-resistantmaterials and heat insulation structures has faced difficult problems. There is also ademand for a breakthrough in durability, with development speeding along.
[0004]
In light of the foregoing, an object of the present disclosure is to provide an innovativeobject surface structure with reduced fluid resistance. The object surface structure with
reduced fluid resistance, based on breakthroughs in hydrodynamic theory, is capable ofreducing fluid resistance of a surface of an object more than that of a flat surface;enhancing the fuel economy, acceleration, maximum speed, and stability of any
transportation; contributing to global efforts to realize energy saving and alleviate
environmental issues; and enhancing the durability of heat-resistant materials and heatinsulation structures and lowering costs by reducing frictional heating, problematic drag,and the like of objects flying at ultra-high speeds to levels significantly above that oftechnology in the related art.
2)
Next, as illustrated in FIG. 2, the core 1 with a bell-like shape is disposed at apredetermined position in a cavity in a mold for a final hollow molded product.
The mold includes three molds: a mold A denoted as 20 in FIG. 2, a mold B denoted as
30, and a mold C denoted as 40. The mold A includes protrusion portions 22 and 23, themold B includes protrusion portions 32 and 33, and the mold C includes protrusion
portion 41.
In particular, the protrusion portion 22 of the mold A and the protrusion portion 32 of
the mold B are in contact with one another at an upper protrusion portion 11 of the core
1, the protrusion portion 23 of the mold A and the protrusion portion 33 of the mold B
are in contact with one another at a through-hole 12 of the core 1 and are disposed
separated from an inner wall of the core 1. Furthermore, a recess portion 13 of the core
1 is fit on the protrusion portion 41 of the mold C, and the core 1 is disposed at apredetermined position in the cavity of the mold.
As illustrated in FIG. 2, an outer shell resin (B) 5 is injected from an injection opening
21 at the injection molding temperature described above (320°C) around the core 1
disposed in the mold. Next, injection molding is performed, then cooling, and a integral
core molded body is obtained.
Good: The outer shell resin displayed no cracking (no core deformation and an integral
core molded body was obtained).
Fair: The outer shell resin displayed cracking (slight core deformation upon injection

molding using resin (B))
Poor: The outer shell resin displayed significant cracking (significant core deformation
upon injection molding using resin (B)).
Corrections: 記号「 〇、△、×」 を英語に変えました。
3)
A zoom len structure with a simple structure, comprising:a lens barrel comprisinga fixed lens group located at either end of an optical axis L, andtwo movable lens groups located between the fixed lens groups,
a first of the two movable lens groups being a movable lens group forzooming and being capable of changing an image magnification of an object, asecond of the two movable lens groups being a movable lens group for focusing
for focus adjustment, and the two movable len groups being movable along theoptical axis L; whereina main movable shaft 5 and a moved shaft 6 are disposed parallel with the optical axis
L in an area centered around the optical axis L;
a lens frame of the movable lens group for focusing 4 and a main movable body 8 integral
therewith are slidably coupled to the main movable shaft 5;a lens frame of the movable lens group for zooming 3 and a moved body 9 integral
therewith are slidably coupled to the moved shaft 6; andthe movable lens group for zooming 3 and the movable lens group for focusing 4 arecapable of moving along the optical axis L by driving the main movable body 8 associatedwith the main movable shaft 5 to move the moved body 9 associated with the moved
shaft 6.